THE 29-YEAR-OLD model and her fiance Wiz Khalifa welcomed their ‘perfect’ first child Sebastian Taylor Thomaz into the world on Thursday.Wiz, 25, tweeted: ‘Happy Birthday Sebastian "The Bash” Taylor Thomaz! Everyone welcome this perfect young man into the world.’Amber then added her own message: ‘Happy Birthday to our baby boy Sebastian "The Bash” Taylor Thomaz! I’m so happy u guys I fell in love all over again! :-)’Stars were quick to add their congratulations. Rihanna, who herself turns 25 today, wrote: ‘Congratulations to my fam @mistercap and @muvarosebud !!! Welcome baby Bash! You’re born in an exquisite month #babypisces.’Rapper Wiz had earlier posted a picture of himself in doctor’s scrubs, including a shower cap and a face mask.After the couple’s child is born, Amber and Wiz will resume their wedding plans.‘It makes more sense for the baby to be in the wedding than for her to be pregnant,’ said Wiz. ‘Some people, they rush and do it, but it works both ways.’Amber added: ‘Being pregnant, I’m tired a lot. So to have a wedding and planning it all out and the reception - I just don’t want to be sleeping when everybody’s partying at our wedding.