Wiz Khalifa and Amber Rose are parents

Wiz Khalifa and Amber Rose arrive at the 55th annual Grammy Awards at Staples Center on Feb. 10, 2013, in Los Angeles. / Getty

Rapper Wiz Khalifa and his model fiancee, Amber Rose, welcomed their first child, Sebastian Taylor Thomaz, on Thursday.

Khalifa announced the news on Twitter:

Happy Birthday Sebastian "The Bash" Taylor Thomaz!!! ?????? Everyone welcome this perfect young man into the world
— Wiz Khalifa (@wizkhalifa) February 21, 2013

Rose also tweeted about their new family addition:

Best daddy ever.... Up with the baby so Muva can go back to sleep :-) instagr.am/p/WB19oMQvL-/
— Amber Rose (@DaRealAmberRose) February 22, 2013

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Khalifa proposed in March 2012, and Rose revealed she was expecting in September while on the red carpet of the MTV Video Music Awards. Earlier this month, Rose showed off her baby bump at the Grammy Awards in Los Angeles.

She's been documenting some of her pregnancy on Twitter. In January, Rose wrote: "Today was the first day of my home birthing classes. No meds, no hospital, just the privacy of my own home. I'm so excited for this experience!"