Blake Lively was called a “bitch” by her Sisterhood of the Traveling Pants co-star Amber Tamblyn after she pranked her friend in revealing the birth of her first child.

Of course, she meant it in an endearing way.

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

Tamblyn said her friend invited her to their house 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 told the magazine that all of the Traveling Pants gals had visited their new god baby, including America Ferrera and Alexis Bledel.

Aw! All of Blake Lively's #SisterhoodoftheTravelingPants co-stars have met her new baby! http://t.co/C33fzM1KdA pic.twitter.com/7cND9CJ1MJ

— JustJared.com (@JustJared) January 11, 2015

“I’m very excited for her and Ryan, and to be an auntie,” Tamblyn 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