Levi Johnston is opening his big fat mouth about his sex life with Bristol Palin on national TV! The 18-year-old appears on the Tyra Banks show and discusses his relationship with Palin, who he has a 3-month-old son with.

Johnston reveals he and Palin, the daughter of Alaska Governor Sarah Palin, practiced safe sex “most of the time” and believes her mother knew they were having sex. “I’m pretty sure she probably knew. Moms are pretty smart,” he says.

Palin and Johnston were engaged last summer but split last month. At the time Johnston said he needed to “mature” before getting married. The pair remain friends and plan to raise son Tripp together. Johnston’s interview with Banks airs on April 6.

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