Lance Armstrong Tweets: Olivia Marie Armstrong has arrived! (PHOTOS)

olivia marie armstrong aka cinco

Olivia Marie Armstrong aka 'Cinco'

Lance Armstrong and his partner Anna Hansen have welcomed a new baby into their family.  The seven-time Tour de France winner announced the news on his Twitter page early Monday morning, October 18: "Olivia Marie Armstrong has arrived!"

Olivia Marie Armstrong is the second child of Anna Hansen, who gave birth to Maxwell Edward Armstrong on June 4, 2009.  The newly minted big brother had this to say on Twitter some 13 hours ago: "Why do I get the feeling that things are about the change around here ??"

Nine hours after announcing the blessed event, Armstrong added another 'tweet': Good morning! Thanks to you all for the support and well wishes.  Momma and Olivia are doing great.  She's a beauty."

The 39-year-old super athlete has three children with his first wife Kristin: Luke is 11 and his twin sisters Isabelle and Grace will turn 9 in November.  Family photos here.

In June the family had lunch and posed for photos at the luxury seaside French Riviera villa of musician Bono.

More photos below: