"No Strings Attached," Ashton Kutcher and Natalie Portman, earned the No. 1 spot at the weekend box office with $20.3 million in gross receipts.

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"The Green Hornet," with Seth Rogen and Cameron Diaz, was a close second with $18.1 million. "The Dilemma," a buddy pic with Vince Vaughn and Kevin James, was third with more than $9.72 million.

All studio estimates are via Box Office Mojo.

"The King's Speech" was fourth, close on the leaders' heels with more than $9.16 million; "True Grit" fifth with $8 million; "Black Swan" sixth with $6.2 million; "The Fighter" seventh with more than $4.51 million; "Little Fockers" eighth with more than $4.39 million; and "Yogi Bear" ninth with $4.06 million.

"Tron Legacy" was 10th with more than $3.7 million.