Poor Jamie Lynn. A new mom AND a scandal to deal with? “Whatever doesn’t kill you will make you stronger,” J-L — let that be your mantra.

So, here’s the deal. Apparently, Jamie Lynn shares Britney’s taste in men because this guy’s a piece of work.

Apparently, her fiance and (baby’s daddy) Casey Aldridge (19) cheated on her with some 28-year-old named Kelli Dawson.

Dawson claims, in the InTouch interview, that she and Casey started hooking up when Jamie Lynn was 6 MONTHS PREGNANT! Brutal.

So sad for the baby and poor Jamie Lynn, who seems to JUST want to stay OUT of the spotlight….

Who knows? It might not be true. Maybe Kelli Dawson is pulling a “Chloe” on them (I’ve been watching TOO MUCH Young and the Restless lately…), and it’s all a lie! Here’s hoping…. But, that ewwy picture of Casey and Kelli on the top right corner of the cover is pretty darn telling….