"Hi, I'm Olivia Marie Armstrong. Otherwise known as "Cinco"." Lance Armstrong tweeted for his new baby girl today.

39-year-old Armstrong is a dad five time over and accoroding to CNN.com : "This is his second child with girlfriend Anna Hansen, with whom he also has a 16-month-old son named Max."

Armstrong also has three kids with with ex-wife Kristin Richard Luke, 11, and twins Isabelle and Grace, who turn 9 next month.

"Olivia Marie Armstrong has arrived!," he tweeted today and posted this photo of the new born Armstrong.

Lance Armstrong tweets birth announcement of Olivia Marie...his 5th child