"Just between the 10,149 of you and me, my wife and I are expecting our second child," Wolf joked to his followers. "We are expecting that because she's pregnant. Happy us."
Kelley Wolf, 35, appeared on "The Real World: New Orleans" on 2000, and on MTV's "The Challenge" in 2002. She and her former "Party of Five" star beau tied the knot in her hometown of Fayetteville, Ark., in 2004.