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The romantic comedy enjoyed a $7,225 (£3,473) site average in its opening weekend in the territory and stars popular US comedian Dane Cook and Jessica Alba. It is the directorial feature debut from Mark Helfrich, who has edited films such as Rush Hour 3 and X-Men: The Last Stand.
Lionsgate UK CEO Zygi Kamasa said the film was 'a great example of the diversified slate of films that Lionsgate are building to become a leading independent studio'.
Meanwhile, political drama Lions For Lambs opened to number six in the chart with a $1.3m (£658,282) take across 404 screens. The film, distributed through Twentieth Century Fox, had a $3,390 (£1,629) site average over the weekend. It is directed by Robert Redford, who also stars in the film alongside Tom Cruise and Meryl Streep.
Indian sensation Om Shanti Om came up blazing into the chart over the weekend with a $1.1m (£515,985) take from just 52 sites, including £20,248 of Thursday previews. The romantic comedy, starring Bollywood sensation Shah Rukh Khan, was at number seven and boasted this weekend's highest screen average at a whopping $20,642 (£9,923). The film, released through Eros International, opened in conjunction with the Hindu holiday Diwali, or the Festival Of Lights.
Paramount Pictures International (PPI)'s Into The Wild made the top 10 over the weekend, with a $409,807 (£196,994) take from only 84 sites. The Alaskan adventure, which is written and directed by Sean Penn, had a $4,879 (£2,345) site average over the three-day period.
PPI had another top 10 hit this weekend with Stardust, which crept up to number two despite a 10% drop over the weekend. The fantasy adventure, directed by Matthew Vaughn, generated $2.6m (£1.2m) from 459 sites for a $5,794 (£2,785) site average. It has grossed $23.6m (£11.3m) to date.
Disney/Pixar animation Ratatouille was finally ousted out of the number one slot after four weekends at the top. The family film fell a modest 19% to number three with a $2.5m (£1.3m) weekend take across 459 sites. It has generated more than $45.5m to date.
And Cate Blanchett starrer Elizabeth: The Golden Age stayed put at number four over the weekend, taking $1.9m (£929,536) across 453 sites. The Working Title production, released through Universal Pictures International (UPI) fell 31% in its second weekend and has generated $6.5m (£3.1m) to date.
Vampire film 30 Days Of Night, released through Icon Film Distribution, fell 45% to number five. The horror film, based on a series of cult graphic novels written by Steve Niles and Ben Templesmith, grossed $1.7m (£849,138) from 385 sites for a $4,588 (£2,206) site average. It has grossed more than $6m (£3m) in the UK after two weekends on release.
Saw IV, the second top 10 horror film over the weekend, fell 53% to number eight and was unable to cross the $1m mark. The gory film, released through Lionsgate, took $971,350 (£466,928) from 339 sites and has generated $12.1m (£5.8m) to date.
Pathe Distribution's Eastern Promises, directed by David Cronenberg, fell three places to number nine. The crime drama, starring Naomi Watts and Viggo Mortensen, took $430,766 (£207,069) from 177 sites and has made $3.8m (£1.8m) after three weekends on release.
Elsewhere in the chart, Sony Pictures Releasing International (SPRI)'s first Indian production Saawariya, was at number 12 with a $334,897 (£160,985) take from 48 sites while Robert Rodriguez's Grindhouse instalment, Planet Terror, opened to $168,284 (£80,894) from just 51 sites. And Tamil film Azhagiya Tamizh Magan entered at number 16 with a $160,755 (£77,275) take.
The top 20 films in the UK generated $17.8m from the period of November 9-11 and were collectively down 9.9% compared to the same period last year.