Teen Mom star Catelynn Lowell's brother is about to experience parenthood for the first time. Nicholas Radtke revealed on Christmas Day that he and his girlfriend, Emma Smith, are expecting their first baby together. "Welp, Santa has brought me the greatest gift I've ever received. I'm having a baby yall🥲🥹," Radtke, 19, wrote via Instagram on Thursday, December 25. "Surprise! expected in May 2026 🌼." In a joint social media post with Smith, Radtke shared a collage of photos from the moment they announced their news in front of a Christmas tree.