Kylie Jenner ends pregnancy rumours... by announcing her daughter's arrival!

US reality TV star and cosmetics tycoon Kylie Jenner has delivered a daughter with her beau, rapper Travis Scott, she announced Sunday.

Jenner, 20, runs Kylie Cosmetics in addition to appearing in her family's long-running reality show "Keeping up with the Kardashians."

The baby's name was not immediately announced. She was born in Los Angeles on February 1.

Jenner is normally a busy social media machine-feeder. But her pregnancy was a relative blackout, which she said was her decision.

"I knew my baby would feel every stress and every emotion. So I chose to do it this way for my little life, and our happiness," she said in a statement on Twitter.