This is quite the birthday surprise for Kylie Jenner! The teen — who turns 20 tomorrow — is reportedly expecting baby No. 1 with boyfriend Travis Scott. Sources told OK! Magazine that the star “couldn’t be more excited” about the news!

Friends of Kylie’s also revealed to OK! that she allegedly wasn’t drinking at a recent birthday party — maybe because she’s underage?! — and that she also hasn’t been going out as much. In fact, her own birthday party is supposed to be super low-key, which adds even more fuel to these reports. “Kylie kept to herself with the excuse that she was focused on her new makeup line,” sources told the mag. “But we all think she’s staying out of the spotlight until she’s ready to share her news. She’s been keeping low-key for months now, and everyone thinks she’s pregnant.”

EXCLUSIVE: Kylie Jenner Showers Travis Scott With Gifts, Loves Being His Sugar Mama

She and Travis — who have only been dating for, like, five minutes — have reportedly been off birth control for a while. A previous source told OK in June, “They’re not using protection and she’s told a bunch of people that Travis is baby daddy material. Kylie’s moving way too fast with Travis but this is the way she rolls.” They added that Trav is allegedly “laughing it off because he doesn’t think she’s serious, but he won’t be seeing the funny side when she tells him they’re expecting.” Now that she’s reportedly four months along, we wonder if he still thinks this is all a joke!

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If, in fact, the star is with child, she will be due around the same time as sister Kim’s surrogate. Awww. And since the report comes just after the announcement that the lip kit mogul has made $420 million by selling lipsticks, it doesn’t sound like she’ll have any difficulty paying for diapers…

Life of Kylie airs Sundays at 9 p.m. EST on E!