Lance Armstrong Lance Armstrong

Lance Armstrong has some new Twitter competition: his baby daughter.

The 39-year-old cyclist announced the birth of Olivia Marie Armstrong, but didn't give any specifics.

That said, Olivia already has a Twitter handle.

It's a boy for Lance Armstrong

"Thanks to you all for the support and well wishes," the elder Armstrong tweeted, followed by a picture. "Momma and Olivia (@Cincoarmstrong!) are doing great. She's a beauty!"

Olivia's first post-birth tweet? "Well, I made it out! What's happening? Sleeping."

Armstrong and girlfriend Anna Hansen have a 16-month-old son, Maxwell. Armstrong has 9-year-old twin daughters, Isabelle and Grace, and an 11-year-old son, Luke, with ex-wife Kristin.