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Round two of diaper duty for Levi Johnston!

After fathering son Tripp, 3, with ex-fiance Bristol Palin, the news-making Alaskan, 21, is going to be a dad again, his rep confirmed to Us Weekly on Tuesday.

The mom-to-be is Sunny Oglesby, Johnston's girlfriend of over one year; TMZ first broke news that Oglesby, a 20-year-old teacher who now lives in his hometown of Wasilla, Alaska, was expecting.

PHOTOS: Bristol and Levi in happier times

Johnston and blonde, blue-eyed Oglesby (a native of Seaside, Oregon) went public with their romance in December 2010.

Johnston and Palin, 21, the eldest child of former Alaska governor Sarah Palin, welcomed son Tripp in late 2008; the couple called off their engagement in March 2009, got engaged again in July 2010, but finally called it off for good three months later.

PHOTOS: Stars who grew up too fast

"Bristol wanted to have a baby," Johnston (who famously posed for Playgirl) sniped to E! News in September 2011. "It all happened on purpose, and I was dumb enough just to roll with hit."