Washington, June 5 : Lance Armstrong and girlfriend, Anna Hansen, have become proud parents of a baby boy.

The multiple Tour de France winner''s lover has given birth to the couple''s first child.

They have named their new son, Max.

Armstrong gave the good news to fans via Twitter, reports Us magazine.

He wrote: "Wassup, world? My name is Max Armstrong and I just arrived. My mommy is healthy and so am I!"

Cancer survivor Armstrong told Usmagazine. com in December that he and Hansen were expecting their first kid together.

"Anna and I are thrilled to confirm that we are expecting in June and our families are ecstatic and grateful," Armstrong told Us at the time.

"We are very much looking forward to what 2009 brings on many fronts. We appreciate [the public] respecting our privacy, as we are both eager to celebrate the holidays as a family," he added.

Armstrong, 37, has three children from a previous marriage. He is father to son Luke, 9, and 11-year-old twins Isabelle and Grace with his ex-wife Kristin Richards. (ANI)