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Wiz Khalifa and Amber Rose are parents

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

Khalifa announced the news on Twitter:

Rose also tweeted about their new family addition:

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!"

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