Credit: Instagram Photo: Teen Mom 3 Girls Take a Group Photo For Briana DeJesus's Birthday May 21, 2013

Even though we have to wait until August for the premiere of Teen Mom 3, the show’s cast — Mackenzie Douthit, Alexandria Sekella, Katie Yeager, and Briana DeJesus — are so close, it’s like Sisterhood of the Traveling Strollers. The ladies were flown to New York City for the week to tape the Teen Mom 3 after show with OG Maci Bookout.

While in NYC, the ladies twerked on their window and also celebrated their castmate Briana’s 18th birthday on May 21 by surprising her with a birthday cake and an indoor picnic!

In a Vine post that her Teen Mom 3 BFF Alexandria posted, we see Briana with her hands covering her eyes as someone (we assume an MTV staffer) approaches her with a lit cake. The birthday girl then blew out her candles and give the camera a good look at the scrumptious cake.

Moments later, bestie Katie posted a Vine clip of the four ladies snacking on the floor.

“We’re having a picnic!” they all sing as Katie gives us a view of the food they’re eating.

Macks has a bowl of salad in front of her (because she’s oh-so healthy), Alex looks like she’s chomping down on some leafy greens as well, while it looks like Briana and Katie are having what we can only hope is a Chipotle burrito.

OK. We’re officially hungry.

We have to say, we’re completely in love with how tight these girls are and we can’t wait to see all four ladies on the tube when Teen Mom 3 airs this summer!

Will you tune in when Teen Mom 3 airs in August? Tell us below!