Allison Williams is cheering on her former Girls costar Chris Abbott as he prepares to become a father with girlfriend Aubrey Plaza. "I just saw that. It's so exciting!" Williams, 38, told E! News on Wednesday, April 15. "I'm very excited for them, it's going to be amazing. ... Just anyone I find out is having a baby, I get excited for that." Williams, who shares son Arlo, 4, with husband Alexander Dreymon, also shared some parenting advice for Abbott, 40, and Plaza, 41 - which was to not let anyone give advice at all. "Don't listen to anyone," she said. "Trust your instincts.