Naomi Watts and Liev Schreiber now are parents of two boys. Their second son joined Mom, Dad and big brother Alexander Pete Schreiber, 11/2, Saturday, the 40-year-old actress' rep told Watts and Schreiber, 41, have been a couple since 2005.

Sheen girls in crash

A spokesman for Charlie Sheen says the actor's two young daughters were involved in a collision on a highway in Malibu, Calif., but were not injured.

Authorities say 4-year-old Sam and 3-year-old Lola were in a car driven by their nanny Friday. It was struck by a car making a turn in front of them on the Pacific Coast Highway. Sheen's spokesman says the children were in car seats.

Sheen shares custody of the girls with ex-wife Denise Richards. He also has an older daughter with a former girlfriend and is expecting a fourth child with his current wife, Brooke Mueller.

Riveting box office

Audiences sat still for Keanu Reeves' sci-fi remake The Day the Earth Stood Still, making it the weekend's top movie with $31 million, according to studio estimates yesterday. The 20th Century Fox release also added $39 million in 90 overseas markets for a worldwide total of $70 million.

The movie updates the 1951 tale of an alien and his giant robot enforcer who come to Earth to warn about the consequences of humanity's destructive nature.

The Warner Bros. holiday romp Four Christmases slipped to second place with $13.3 million. The Reese Witherspoon-Vince Vaughn comedy's three-week total is $88 million.

Another seasonal tale, Overture Films' Nothing Like the Holidays, opened a weak No. 7 with $3.5 million.

Overall box office plummeted compared with the same weekend last year, when I Am Legend opened with $77.2 million and Alvin and the Chipmunks debuted with $44.3 million.

A rush of films opened with big numbers in limited release to qualify for the Academy Awards. Miramax's Doubt (Meryl Streep, Philip Seymour Hoffman) pulled in $525,030 in 15 theaters, averaging $35,002 a cinema, compared with $8,708 in 3,560 locations for The Day the Earth Stood Still.

Warner Bros.' Gran Torino, starring the film's director, Clint Eastwood, in six locations, took in $284,000 to average $47,333. The Weinstein Co. drama The Reader, with Kate Winslet, rang up $170,000 in eight theaters for a $21,250 average. And Steven Soderbergh's four-hour-plus film bio Che, with Benecio Del Toro in the title role, an IFC Films release, took in $60,100 in two cinemas to average $30,050.