( Entertainment Weekly ) -- Neither the magic of Harry Potter nor the combined star power of Katherine Heigl and Gerard Butler was enough to keep a crew of wise-cracking guinea pigs from scurrying to the top of the box office this weekend . Disney 's family comedy `` G-Force '' made an estimated $ 32.2 million in its debut . Disney 's family comedy `` G-Force , '' produced by Jerry Bruckheimer and featuring the voices of Nicolas Cage , Will Arnett , and Penelope Cruz as a team of world-saving rodents , made an estimated $ 32.2 million in its debut . Despite opening hot on the heels of the one-week old `` Harry Potter and the Half-Blood Prince , '' the animation/live action hybrid pic was a hit with young audiences , pulling 55 percent of its viewers from the under-18 crowd . But Potter 's box office magic has n't worn off just yet : The series ' sixth installment landed in the number two spot its second weekend with $ 30 million , bringing its total to $ 221.8 million . After just 12 days in theaters , 'Half-Blood ' is already the fifth biggest hit of the year domestically , not to mention overseas , where the powerhouse has raked in an additional $ 236 million . There was plenty for adults to enjoy at the box office , too . `` The Ugly Truth , '' a raunchy R-rated rom-com that pits Katherine Heigl and Gerard Butler in a battle of the sexes , scored an impressive $ 27 million bow , a career best for both Heigl and director Robert Luketic ( `` Legally Blonde '' ) . The weekend 's other wide release , Warner Bros ' creepy `` Orphan '' -- starring Peter Sarsgaard and Vera Farmiga -- pulled in $ 12.8 million from an audience that was 55 percent female . Lower down on the chart , Fox Searchlight 's `` ( 500 ) Days of Summer '' ( at number 11 with $ 3 million ) is still building momentum . The quirky rom-com posted a hefty $ 19,176 per-site average and a 95 percent increase over its debut last weekend . CLICK HERE to Try 2 RISK FREE issues of Entertainment Weekly . Copyright 2009 Entertainment Weekly and Time Inc. All rights reserved .
Disney 's family comedy brought in an estimated $ 32.2 million over the weekend . The sixth installment of the `` Potter '' series raked in another $ 30 million at No . 2 . `` The Ugly Truth , '' starring Katherine Heigl and Gerard Butler , took in $ 27 million . Check out the other top earners on this weekend 's top 10 list .