SHOW BIZ: Weekend Movie Box Office Estimates: August 5-7, 2011

Rank	Film	Distributor	Weekend Total	# Of Screens	Weeks Playing	Cumulative Box Office
1	Rise of the Planet of the Apes	Fox	$54,000,000	3,648	1	$54,000,000
2	The Smurfs	Sony	$21,000,000	3,395	1	$76,202,000
3	Cowboys and Aliens	Universal	$15,748,000	3,754	2	$67,368,000
4	The Change-Up	Universal	$13,502,000	2,913	3	$13,502,000
5	Captain America: The First Avenger	Paramount	$13,000,000	3,620	1	$143,182,000

For more information, access the complete chart on boxofficemojo.com.

1. "The Rise of the Planet of the Apes:" The Planet of the Apes franchise gets the origin treatment in this 20th Century Fox production from director Rupert Wyatt (The Escapist). The script, written by Amanda Silver and Rick Jaffa, concerns a group of American scientists whose genetic experiments lead to an uprising by a race of intelligent apes that they helped create. James Francostars, with Freida Pinto and John Lithgow heading up the rest of the cast. - Jeremy Wheeler, Rovi

2. "The Smurfs:" The Smurfs make their first 3D trip to the big screen in Columbia Pictures'/Sony Pictures Animation's hybrid live-action and animated family comedy, 'The Smurfs'. When the evil wizard Gargamel chases the Smurfs out of their village, they're forced through a portal, out of their world and into ours, landing in the middle of New York's Central Park. Just three apples high and stuck in the Big Apple, the Smurfs must find a way to get back to their village before Gargamel tracks them down. -moviefone.com

3. "Cowboys and Aliens:" 1875. New Mexico Territory. A stranger (Daniel Craig) with no memory of his past stumbles into the hard desert town of Absolution. The only hint to his history is a mysterious shackle that encircles one wrist. What he discovers is that the people of Absolution don't welcome strangers, and nobody makes a move on its streets unless ordered to do so by the iron-fisted Colonel Dolarhyde (Harrison Ford). It's a town that lives in fear.

But Absolution is about to experience fear it can scarcely comprehend as the desolate city is attacked by marauders from the sky. Screaming down with breathtaking velocity and blinding lights to abduct the helpless one by one, these monsters challenge everything the residents have ever known.

Now, the stranger they rejected is their only hope for salvation. As this gunslinger slowly starts to remember who he is and where he's been, he realizes he holds a secret that could give the town a fighting chance against the alien force. With the help of the elusive traveler Ella (Olivia Wilde), he pulls together a posse comprised of former opponents--townsfolk, Dolarhyde and his boys, outlaws and Apache warriors--all in danger of annihilation. United against a common enemy, they will prepare for an epic showdown for survival. -moviefone.com

4. "The Change-Up:" Growing up together, Mitch (Ryan Reynolds) and Dave (Jason Bateman) were inseparable best friends, but as the years have passed they've slowly drifted apart. While Dave is an overworked lawyer, husband and father of three, Mitch has remained a single, quasi-employed man-child who has never met a responsibility he liked. To Mitch, Dave has it all: beautiful wife Jamie (Leslie Mann), kids who adore him and a high-paying job at a prestigious law firm. To Dave, living Mitch's stress-free life without obligation or consequence would be a dream come true.

Following a drunken night out together, Mitch and Dave's worlds are turned upside down when they wake up in each other's bodies and proceed to freak the &*#@ out.

Despite the freedom from their normal routines and habits, the guys soon discover that each other's lives are nowhere near as rosy as they once seemed. Further complicating matters are Dave's sexy legal associate, Sabrina (Olivia Wilde) and Mitch's estranged father (Alan Arkin). With time not on their side, Mitch and Dave comically struggle to avoid completely destroying each other's lives before they can find a way to get their old ones back. -moviefone.com

5. "Captain America: The First Avenger:" Marvel Studios brings their prodigious patriot to the big screen with this WWII-set adventure about a once-meek U.S. soldier-turned-hero (Chris Evans) who gains strength and agility far beyond that of a normal human being after taking an experimental super-serum. The Wolfman's Joe Johnston directs from a script by Chronicles of Narnia screenwriters Christopher Markus and Stephen McFeely. Hugo Weaving co-stars as the dreaded Red Skull, withTommy Lee Jones, Toby Jones, Sebastian Stan, and Hayley Atwell rounding out the cast. - Jeremy Wheeler, Rovi