It was a very crowded weekend at the theaters with four varied films vying for a piece of the box office pie and the top spot.

Elysium (read our review) is the number 1 film this weekend with $30.4 million. Early estimates projected the film, which was made for $115 million, might pull in a few extra million, but an overcrowded weekend likely worked against Elysium.

And while a $30 million opening is nothing to scoff at, it's slightly below two other notable 2013 sci-fi releases, Pacific Rim and Oblivion. It's even lower than the opening weekend of Neill Blomkamp's first film, District 9 ($37 million).

The R rated comedy We're the Millers (read our review) comes in at number 2 with $26.5 million. The film actually opened on Wednesday of this week and is already up to $38 million. While we wait to see if the film has any legs, We're the Millers opening weekend tally is actually better than two other very popular comedies: Tropic Thunder and Pineapple Express.

Obviously, the star power of Jennifer Aniston had a lot to do with this strong opening, but we'd suspect that Jason Sudeikis has his fair share of followers as well. At this point, it looks like dropping out of SNL was a wise decision.

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Disney's Planes (read our review) is the number 3 film with $22.5 million. Carefully constructed to appeal to the Pixar crowd, Disney's film failed to hit the same type of numbers we expect from its sister studio. At the same time, Disney's decision to take Planes from straight-to-DVD to the theater will likely pay off, as the film only cost $50 million to make.

The number 4 film this weekend is Percy Jackson: Sea of Monsters (read our review) with $14.6 million. Like We're the Millers, Percy Jackson 2 opened this past Wednesday, and has accrued a five-day total of $23 million.

While the first Percy Jackson debuted in early February 2010 to a surprisingly strong $30 million opening, Sea of Monsters failed to hit - let alone pass - that same mark. Unfortunately, this less-than-stellar opening squashes almost any possibility that Percy Jackson franchise will continue after Sea of Monsters.

Rounding out the top 5 is 2 Guns with $11 million. The Denzel Washington and Mark Wahlberg buddy cop action-comedy simply couldn't contend with four new releases, and fell 58.9% in its second weekend. The film has grossed $48 million total.

Coming in at number 6 is The Smurfs 2 with $9.5 million. Sony certainly hoped for more out of this animated sequel, which has only grossed $46 million after two weeks.

Hugh Jackman fights on a train as Logan in The Wolverine

The Wolverine comes in at number 7 with $8 million, which brings its domestic total up to $111 million and worldwide total to $306 million. If The Wolverine stays on track it should finish somewhere in the middle of the X-Men pack – on par with the likes of the first X-Men and First Class (~$150 million), but well below X2 and The Last Stand ($200 million+).

In at number 8 is The Conjuring with $6.7 million. In a year where horror movies have performed very well, this original tale has outdone them all and is now at $120 million.

Despicable Me 2 is the number 9 film this weekend with $5.7 million. Universal's mega-hit animated sequel is now at $338 million domestic and $745 million worldwide.

Rounding out the top 10 is Grown Ups 2 with $3.7 million. The Adam Sandler comedy has raked in $123 million over 5 weeks.

Outside the top 10: Pacific Rim finally opened in Japan, but only managed a 5th place, $3 million opening. Although the film has done well overseas, it failed to capture the Japanese market, which is strange considering Pacific Rim draws heavily from Japanese monster movies and anime. The film is now up to $344 million worldwide, though.

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[NOTE: These are only weekend box office estimates - based on Friday and Saturday ticket sales coupled with adjusted expectations for Sunday. Official weekend box office results will be released Monday, August 12th - at which time we'll update this post with any changes.]

Source: Box Office Mojo