​Kylie Jenner just turned 21 last week, and she's already a mom, a beauty icon, and one of the most successful women in business. 

Over the weekend, ​a source shared that ​Kylie had "the best time" celebrating ​her birthday with family and friends“She gets a bit emotional thinking back about everything amazing that has happened this year,” the source explained. “She had a smaller birthday celebration at home with Stormi. She just loves being her mom” 

Kylie recently ​covered Forbes, where she was predicted to become the ​youngest self-made billionaire. "[She] is very proud that she is only 21 and has accomplished so much already,” ​the source shared. "[But] she says the best thing to happen to her is Stormi. She is crazy about her little girl.” 

In an Instagram post on Thursday, Kylie wrote, "bringing in my birthday tonight with my most special gift. What was life before you, Stormi. I love you my little angel."

The source also shared Kylie and her boyfriend ​Travis Scott are loving their time as parents, explaining, “They are amazing parents and equally excited about spending as much time as possible with Stormi.” 

On Friday, Kylie posted an adorable video on her Snapchat of Travis and Stormi laughing together and dancing to some rap music. 

​​We're so happy for this new little family, and we can't wait to see more of them in the ​15th season of Keeping Up With the Kardashians, which premiered on August 5.