Catelynn Lowell

"Teen Mom" stars Catelynn Lowell and fiancé Tyler Baltierra might not be getting married as soon as you think ... TMZ has learned the duo has joined the new season of "Couples Therapy." Catelynn and Tyler -- who infamously put their "Teen Mom" kid up for adoption back in 2008 -- have been on and…

"Teen Mom" star Catelynn Lowell -- the girl who gave her baby up for adoption on the show -- got into some serious HIGH jinks this summer, ripping a massive bong at a party with friends. The photo -- obtained by TMZ -- tells the story. It was snapped last month at a friend's get-together in…