The Tina Fey/Amy Poehler odd couple comedy Baby Mama took first place at the box office, raking in $18.3 million in its opening weekend. Coming in second was the stoner comedy Harold & Kumar Escape from Guantanamo Bay, which earned a respectable $14.6 million in its debut. The Jet Li/Jackie Chan martial arts fantasy The Forbidden Kingdom placed third with an $11.2 million tally, followed closely by full-frontal romantic comedy Forgetting Sarah Marshall's $11 million gross. Rounding out the top five was the adventure fantasy Nim's Island, which earned $4.5 million in its fourth week in release.
Source: boxofficemojo.com