Levi Johnston confirms he's going to be a dad again

(CBS News) Levi Johnston has done it again. The 21-year-old father of Bristol Palin's son, Tripp, is expecting a baby with his new girlfriend, Sunny Oglesby.

"I'm really excited and I'm looking forward to having a new baby," he told TMZ. "I love my son Tripp more than anything, but unfortunately I don't get to see him a whole lot. So Sunny and I are looking forward to raising a baby together and maybe eventually getting married or something."

The former Playgirl centerfold said the pregnancy wasn't planned, adding, "But things happen ... we're both very happy with what came of it."

Johnston and Oglesby, a 20-year-old teacher, have been dating for more than a year and found out about the pregnancy a few months ago. The mother-to-be lives in Johnston's hometown of Wasilla, Alaska.

Meanwhile, Johnston claims he's in the middle of an ongoing battle with the Palins to see his 3-year-old son, explaining "it's still a big pain" to get access to his boy.

"I'm going to fight for him until the day I die," Johnston told TMZ about Tripp, the grandson of ex-Alaska Gov. Sarah Palin.