The model gave birth to the couple's son, Sebastian Taylor Thomaz, on Thursday (21Feb13), and the Black and Yellow hitmaker announced the news to fans in a post on the social networking site.
The pair's celebrity friends then flocked to send their well wishes, with Rhymes declaring, "Congrats 2 (sic) my brother Wiz Khalifa & Amber Rose on the birth of their new young king. God bless."
Rapper Xzibit wrote in a post, "Congrats to Wiz Khalifa and the addition to your family! Fatherhood is a beautiful thing to experience. You're gonna do great", while Snoop Dogg added, "Welcome 2 fatherhood!!!"
Sean Kingston gushed, "Congrats to my brother from another Wiz Khalifa today was a big day for him... Welcome to the world baby Sebastian!", while Rihanna, who turned 25 on Wednesday (20Feb13), declared, "Welcome baby Bash! You're born in an exquisite month... baby Pisces."
New mother Rose replied to Rihanna and invited the Umbrella hitmaker and her boyfriend Chris Brown to visit the new arrival. She wrote, "Thank u (sic) sweets! U & Chris gotta (sic) come over soon & love his lil (sic) butt up he's soooo beautiful! He looks like his mama."
Rose also gushed about the new arrival, "I'm so happy u guys. I fell in love all over again!"