Lance Armstrong's latest set of wheels are attached to a stroller.
The seven-time Tour de France champion has welcomed a son with girlfriend Anna Hansen, their first child together and his fourth.
"Wassup, world? My name is Max Armstrong and I just arrived. My Mommy is healthy and so am I!" tweeted his star cyclist daddy Thursday evening.
Armstrong was kind enough to post a picture of the newborn online, as well. (He is totally rockin' the hat look.)
Armstrong also has three children with ex-wife Kristin.
"Anna and I are thrilled to confirm that we are expecting in June and our families are ecstatic and grateful," the cancer-survivng 37-year-old said in a statement in December, when he confirmed they were expecting.
"We are very much looking forward to what 2009 brings on many fronts. We appreciate respecting our privacy, as we are both eager to celebrate the holidays as a family."
The comebacking athlete recently finished 12th in the Giro d'Italia, part of his preparation for the next Tour de France, which kicks off July 4.