Facebook billionaire Sean Parker is expecting his second child with wife Alexandra Lenas, his rep confirms to Us Weekly Credit: Michael Buckner/Getty Images

One of each! Facebook billionaire Sean Parker and his wife Alexandra Lenas are expecting their second child, a baby boy, his rep confirms to Us Weekly.

"We are overjoyed and excited to welcome the new arrival into our family," Parker, 34, tells Us in a statement. 

Lenas proudly showed off her growing baby bump during the couple's recent vacation. "Sunset silhouette," the singer-songwriter captioned a picture via Instagram on Sept. 8.

The Napster founder and Lenas welcomed daughter Winter in January 2013 and tied the knot in an elaborate ceremony in Big Sur, Calif., that June. "Winter can't wait to be a big sister!" the couple adds to Us.