Shameless has become one of the most popular comedy-drama series on the air since the show's initial premiere. The SHOWTIME cable series first began airing in 2011, and since then, the viewers and fans have truly gotten to know the Gallagher family in all of their glory. The television show tells the story of a Chicago family navigating everyday life and learning how to deal and live with Frank Gallager, the show's elusive and complex character who battles with alcoholism and parenting.

RELATED: Shameless: 10 Canceled Storylines That Would’ve Hurt The Show (And 10 That Would’ve Saved It)

Though the Gallagher family could be considered dysfunctional and chaotic, to say the least, viewers have become captivated by the show's authenticity and drama. Season 10 of Shameless marked the first season of the series without the infamous Fiona Gallagher. Even though Fiona didn't appear in any of the episodes, her impact and presence, for better or worse, will always be a part of the series. Take a look back at Fiona Gallagher's top ten worst moments on Shameless.

The Time Liam Got Into Fiona's Cocaine

Fiona Gallagher Shameless

Who could forget the episode of season 4 when viewers saw Fiona's little brother Liam being rushed to the hospital after getting into the cocaine she had irresponsibly left out? Everything about this episode highlights Fiona's messy tendencies.

After sneaking around with Robbie, Fiona found herself in yet again another spiral as a result of a failed relationship. Instead of addressing the situation or her feelings, in typical Fiona fashion, she decided to party. Fans and viewers were appalled to see Fiona put her little brother's life at risk. "There's the Rub" definitely showcases Fiona at one of her worst moments.

Fiona's Affair With Her Boyfriend's Brother

Fiona Gallagher Shameless

The show is called Shameless for a reason, but sneaking around with a significant other's sibling seems more ruthless than shameless. Viewers anxiously watched as Fiona began hooking up with Robbie, her boyfriend's brother. Fiona makes a minimal amount of effort to end the affair, but ultimately, she struggled with stopping herself.

Robbie's role in Fiona's life clearly was not a good one. Fiona's decision to begin recreationally using cocaine stemmed from her affair with Robbie. Fans and viewers were thrilled to see the storyline finally come to an end when Fiona is forced to face all of her consequences.

Fiona And Gus' Relationship

Fiona's relationship with Gus was so fleeting and brief that some fans and viewers may have even forgotten it ever happened. In season 5 Fiona meets a sweet musician named Gus, and the two quickly fell for one another. The pair only knew each other for about one week when the hastily decided to get married. Fiona seems all-in at first, but then, per usual, things quickly begin to unwind and spiral.

RELATED: Shameless: The 5 Worst Things Frank Gallagher Has Done To His Kids (& 5 They've Done To Him)

When Fiona's ex shows up in town she finds herself yet again being unfaithful. Gus' musical career causes him to be on the road a lot giving Fiona an ample amount of time to act out her usual patterns and poor decision-making process. Eventually, viewers saw the marriage come to a halting crash.

After Fiona Cheated On Her Husband, She Pawned The Wedding Ring

Fiona sits outside in her wedding dress

Just when viewers thought the Gus situation couldn't get any worse Fiona found a way. The couple had finally come to terms with getting a divorce and it seemed like Fiona and Gus were ready to part ways and move on. That was until Gus asked for the engagement ring back. The ring had sentiment and meaning to Gus since the heirloom belonged to his grandmother.

However, when Gus asked for the ring back, he had no idea that Fiona had sold it to a pawn store. Making matters worse, Fiona's romantical interest of the moment, Sean, is forced to step in to buy the ring back since Fiona cannot afford to. Ultimately, Sean uses the ring to propose to Fiona. Talk about messy.

Fiona Took Advantage Of Etta

Viewers were excited to see Fiona explore her potential as a business entrepreneur, but it was far from smooth sailing when it came to Fiona's business pursuits. In season 7 Fiona became invested in Etta, the old lady who owned a laundromat across from the diner Fiona was becoming more involved in. Etta lived on top of the laundromat she owned and when Fiona learned that she might be forced to leave her home she took action.

RELATED: Shameless: 10 Most Hated Supporting Characters

What started as a seemingly good deed ultimately led Fiona to make questionable decisions. Viewers and fans were shocked to see Fiona use her close relationship with the elderly woman to take advantage of her. When Fiona began using the old woman's credit card without her knowing she crossed a new line.

How Fiona Got Her Dog

Fiona Gallagher Shameless

Fiona's dog is a controversial topic amongst fans and viewers of Shameless. Fiona acquired an apartment complex and then one of the residents unknowingly died. When Fiona made the discovery of the dead body she also discovered that the little dog had begun to eat the flesh of the human.

In one of Fiona's most questionable moments she happily greets the dog before picking it up and taking it home. Though it may have been nice that she wanted to care for the dog, it was ludicrous for her to ignore the context in which the pup was found.

Fiona's Overall Decision-Making Process

Fiona holding a drink

Time after time and season after season, Fiona showed viewers and fans that decision-making was clearly not her strong suit in life. In season one Fiona is seen constantly trying to take advantage of a police officer's crush on her to benefit her family's illogical and sometimes illegal ways.

In season 2 Fiona stole a purse off a train. Once or twice her character has also been known to use blackmail to her advantage. Her selfish tendencies often led Fiona to hot water and trouble.

Fiona's Reaction to Debbie's Pregnancy And Child

It is safe to say that the majority of viewers and fans thought Debbie's pregnancy was anything but a good idea, but as Fiona's sister, the audience was still surprised to see her harsh reaction. At first, Fiona tries to manipulate and guilt Debbie into getting an abortion.

RELATED: Shameless: The Worst Thing Each Main Character Has Done

When Debbie's baby is eventually born Fiona refuses to her little sister. Though viewers understand why she might be frustrated with the situation, it was shocking and disappointing to see Fiona act this way.

Fiona Lets Lip Down

Fiona and Lip argue

For the most part, Fiona and Lip's relationship on Shameless has always been a strong one, but even Lip has had his moments and frustrations when it comes to Fiona. In season 9 Lip had found himself trying to foster a young girl named Xan who needed a home.

As Lip frantically ran around trying to make sure the Gallagher household gets approved by social services, Fiona nonchalantly allowed the plan to come crashing down. Lip's disappointment in his sister leads him to eventually blowing up on her.

Fiona Got Kicked Out Of The Gallagher Household

Fiona Gallagher Shameless

Fiona's inability to help Lip with Xan is partially due to the spiral she started to go down when her personal and professional life began to unravel. Her drinking and careless actions had put her on thin ice with the family.

When Lip learned that Fiona played a part in Xan leaving, he decided to kick Fiona out. Viewers and fans were shocked to see Fiona hit what appeared to be rock bottom.

NEXT: Shameless: The Main Characters Sorted Into Their Game Of Thrones Houses