Blake Lively apparently tricked her Sisterhood of the Traveling Pants co-star Amber Tamblyn when revealing that she had given birth to her first child.

“That bitch! She tricked me!” said the laughing Tamblyn when People magazine asked how she learned Blake and husband Ryan Reynolds had welcomed their little bundle of joy.

According to the 27-year-old actress, Lively invited Tamblyn to come on over to their house for a visit pretending that she wanted her friend to see her new home decorations.

“I went up there and I didn’t know, everybody knew but me, and [Blake] does that s**t to me,” Amber told the magazine. “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.”

Why did Amber Tamblyn call Blake Lively a b*tch?! http://t.co/V3UPteIwg0 #TravelingPants #Godmothers #Access pic.twitter.com/LkAeicbVSL

— Access Hollywood (@accesshollywood) January 10, 2015

Tamblyn said all of the Traveling Pants BFFs, including America Ferrera and Alexis Bledel, have visited Lively and Ryan Reynold‘s baby, who made her appearance in December. According to Tamblyn, they are all godmothers for the Reynolds’ little one.

“I’m very excited for her and Ryan, and to be an auntie,” she said. “All of us are godmothers so we are very happy.”

Amber Tamblyn thinks bestie Blake Lively will be "more like a dad." Allow her to explain: http://t.co/hl9cF9WseF pic.twitter.com/yjnrmaNPXT

— Us Weekly (@usweekly) November 18, 2014