Staying hush-hush was hard! Kylie Jenner revealed on Sunday, Feb. 4, that she and boyfriend Travis Scott welcomed a baby girl on Feb. 1 — after months of keeping fans in the dark about her pregnancy, which was frustratingly shrouded in mystery. A source exclusively tells In Touch how tough it was for Kylie’s friends to keep her exciting baby news a secret.

“Keeping Kylie’s pregnancy under wraps for an entire nine months was ridiculously difficult for her friends. It was definitely a relief when they could finally congratulate her. It was the hardest secret to keep,” says the insider, adding that Kylie’s loved ones couldn’t be more excited about the 20-year-old’s bundle of joy. “But everyone’s so happy for Kylie and it’s obvious that she’s going to be a great mom.”

As previously reported, Kylie revealed that she had given birth in a touching Instagram message on Sunday, accompanied by a super sweet video on YouTube, featuring private home videos and never-before-seen photos of her baby bump. “I’m sorry for keeping you in the dark through all the assumptions,” the cosmetics mogul wrote. “I understand you’re used to be bringing you along on all my journeys. My pregnancy was one I chose not to do in front of the world. I knew for myself I needed to prepare for this role of a lifetime in the most positive, stress-free, and healthy way I knew how. There was no gotcha moment, no big paid reveal I had planned. I knew my baby would feel every stress and every emotion so I chose to do it this way for my little life and our happiness.”

“Pregnancy has been the most beautiful, empowering, and life-changing experience I’ve had in my entire life and I’m actually going to miss it,” she continued. “I appreciate my friends and especially my family for helping me make this special moment as private as we could. My beautiful and healthy baby girl arrived Feb. 1 and I just couldn’t wait to share this blessing. I’ve never felt love and happiness like this I could burst! Thank you for understanding.”