Happy Mother's Day to all the moms out there! We love getting to see all our favorite celebrity mamas all year long, so on this special Sunday we want to know which of Hollywood's newest parents are you most excited for this holiday. Sandra Bullock just introduced us to baby Louis, Gisele Bundchen has been out and about with Benjamin and Kourtney Kardashian shared the birth of her son Mason on television. Jennifer Hudson kept her pregnancy very private until close to son David's arrival while Katherine Heigl took a break from Grey's Anatomy to adopt Naleigh. Sarah Michelle Gellar and Freddie Prinze Jr. welcomed Charlotte last September. So, tell us —which new mom are you most excited about this Mother's Day?