By Kate Ward
Updated April 30, 2010 at 03:45 PM EDT

People reports that Lance Armstrong announced via his Twitter account that he’s expecting another child with girlfriend Anna Hansen. “Getting ?’s today about someone I’m following, a certain @Cincoarmstrong. What to say? Yet another blessing in our lives. I cannot wait!” Armstrong Tweeted Thursday night. (@Cincoarmstrong‘s first post read: “I got 2 arms, 2 legs, a nickname, and [I’m] 2 inches long. See y’all in October.”)

The couple have a 10-month-old son, Maxwell Edward. Armstrong is also father to eight-year-old twins Isabelle and Grace and 11-year-old Luke, his children with his ex-wife Kristin.