Cyclist Lance Armstrong isn’t afraid of a challenge. Which is good, since he and girlfriend Anna Hanson are perfectly poised for just that! The couple recently welcomed their second child together. Armstrong Tweeted the news of Olivia Marie‘s arrival this morning. Olivia has four older siblings: Maxwell Edwards, 16 months (from Armstrong’s relationship with Hanson), and Luke, 11, and Isabelle and Grace, both 9, from his marriage to ex-wife Kristin.