Wiz Khalifa and his fiancée Amber Rose are elated to welcome their "perfect" baby boy into the world.

The rapper announced to his Twitter followers Thursday (local time) that his model love gave birth to a son named Sebastian.

Apparently both mother and child are healthy.

Khalifa is excited about fatherhood.

"Happy Birthday Sebastian 'The Bash' Taylor Thomaz!!!" the musician tweeted.

"Everyone welcome this perfect young man into the world."

Khalifa has been open about the baby's arrival within the past few days.

He posted on Instagram on Tuesday a picture of a fetal monitor along with the words "Coming soon..."

Earlier in the day on Thursday Khalifa shared an image of himself in physician's scrubs with the caption reading "Daddy Time."

The pair announced Rose's pregnancy at the MTV Video Music Awards (VMAs) in September last year.

Rose threw a blue-themed baby shower in January.

She and her friends, including singer Christina Milian, tucked into blue snacks, surrounded by decorations of the same shade and her make-up artist pal Priscilla Ono even sported blue hair.

The lovebirds have so far kept quiet on their wedding plans, although Wiz recently confirmed they are planning to tie the knot sooner rather than later.

- Cover Media