Blake Lively surprised her Sisterhood of the Traveling Pants costar Amber Tamblyn with the news that she’d given birth to her baby with husband Ryan Reynolds.

Amber Tamblyn’s Big Surprise

“That b–ch! She tricked me! I went up there and I didn’t know, everybody knew but me, and she does that s— to me,” Tamblyn told People magazine about her trip to Lively and Reynold’s house in Bedford, N.Y. “She was texting me about wallpaper, she was like, ‘You gotta come see my new wallpaper,’ and I went up there, and there was her baby.”

“We’ve all been over,” Tamblyn said, referring to their Sisterhood of the Traveling Pants costars Alexis Bledel and America Ferrara. “I’m very excited for her and Ryan, and to be an auntie. All of us are godmothers so we are very happy.”

“I took pictures with Ryan and the baby and sent them to Ken Kwapis, the Sisterhood director,” Tamblyn added.

Lively and Reynolds welcomed their daughter, Violet, back in December. The two, who began dating in 2010, were married in September 2012.