06/01/2014 at 02:45 PM EDT
and his wife Sunny Oglesby are expecting their second child together, TMZ reports
According to TMZ, the couple announced the news to family and friends by sending out a photo of the two dining on spaghetti with a "we're" sign added to a jar of Prego sauce.
Six weeks after welcoming their daughter
Breeze Beretta – named for an Italian handgun
– Johnston and Oglesby tied the knot in October 2012 in Wasilla, Alaska.
Johnston, 24, is also dad to 5-year-old
Tripp, his son with former fiancée
Bristol Palin. In November, he filed papers
, petitioning for at least equal custody of the former couple's only child.
At the time, Palin's attorney noted that Johnston owed about $66,000 in back child support.