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It’s another quiet weekend at the box office in January.

“No Strings Attached” premiered and took the top position in the weekend box office. The film starring Natalie Portman and Ashton Kutcher is a romantic comedy about a couple trying to keep their relationship about casual sex. The film earned an estimated $20.3 million on 3,018 screens. It was also the only wide-release film to premiere this weekend.

Last week’s top earner “The Green Hornet,” earned $18.1 million, a drop of 46 percent from the previous week. It is the first superhero movie for this year and is starring Seth Rogen and Jay Chou.

“The Dilemma,” dropped one spot to third place with $9.7 million, a drop of 45.4 percent from the previous weekend.

And award-quality films of “The King’s Speech” and “True Grit” still remained in the top five for the box office weekend. “The King’s Speech” is holding its own with $9.16 million, nearly matching last weekend’s gross with only a 0.2 percent drop. And “True Grit,” took fifth place at $8 million.

For the next weekend, it will premiere new films including “The Rite,” “The Mechanic,” and “Prada to Nada.”

“The Rite” is inspired by true events, which is about the training of exorcists in the Vatican. CBS Films will release the remake “The Mechanic” starring Jason Statham. It is the remake of the 1972 Charles Bronson action thriller.

“Prada to Nada” is based on Jane Austen’s “Sense and Sensibility,” but with a Latina spin to it. The film is starring Camilla Belle, Alexa Vega and Wilmer Valderrama.

WEEKEND TOP 10 STUDIO ESTIMATES, January 21-13, 2011

1. No Strings Attached $20.3 M 2. The Green Hornet $18.1 M 3. The Dilemma $9.7 M 4. The King's Speech $9.2 M 5. True Grit $8 M 6. Black Swan $6.2 M 7. The Fighter $4.5 M 8. Little Fockers $4.4 M 9. Yogi Bear $4.1 M 10. TRON: Legacy $3.7 M Source: Box Office Mojo

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