Last week, moviegoers got a "hangover," but got the cure this week with a new romantic comedy starring Sandra Bullock, who locked down the box office with "The Proposal."

The new flick earned Bullock -- who co-stars in the film alongside Ryan Reynolds -- her first #1 movie in 10 years at the weekend box office, and her best opening as well, doubling the her previous best, "Premonition," which debuted to $17.6 million in 2007.

"The Proposal" earned $34.1 million, helping it knock out last week's winner, "The Hangover," which slips to second with $26.9 million this weekend. After three weeks, it's grossed $159 million.

The weekend's other big release was the prehistoric comedy "Year One," starring Jack Black and Michael Cera. The film nabbed fourth place right behind "Up," earning $20.2 million. "Up" took in another $21 million to put its four-week total at $224 million.

In at #5 is "The Taking of Pelham 123" earning $11.3 million; at #6 Ben Stiller's "Night at the Museum: Battle of the Smithsonian" earned $7.3 million; "Star Trek" landed at #7 with $4.7 million; "Land of the Lost" earned the #8 spot with $3.9 million; "Imagine That" took #9 with $3.1 million; and "Terminator Salvation" earned $3 million to round out the top 10.

Overall, the box office was up 3% compared to last year's Father's Day weekend, when "Get Smart" debuted to a surprisingly sharp $38.7 million.

Next weekend, expect big numbers from the highly anticipated sequel "Transformers: Revenge of the Fallen" and the new Cameron Diaz flick "My Sister's Keeper."