According to People Magazine, George Clooney, Alec Baldwin and Meryl Streep will be among the stars presenting at the Jan. 23 Screen Actors Guild Awards, it was announced Thursday. Clooney, a four-time SAG Award best actor winner, was nominated for his performance in Up in the Air. Baldwin, who will co-host the Oscars in March with Steve Martin, got a SAG Award nod again this year for the NBC hit show 30 Rock. Streep is up for leading actress for her role in Julie & Julia. Sandra Bullock, who is nominated for leading actress for The Blind Side, will present the Life Achievement Award to Betty White, her costar in The Proposal.