UPDATE: Garcia says she and Johnston have not “hung out at all since 8th or 9th grade.”
UPDATE: According to E!, Bristol has indeed called off the engagement.

Levi Johnston and Bristol Palin’s road to marriage may have hit a road bump…a growing road bump.

Although Bristol Palin publicly declared that she would not have sex (again) until she was married, it appears Johnston - who not so modestly posed for Playgirl - may not have made that same commitment.

According to a new report in the National Enquirer, Levi - already a father to 18-month-old Tripp - may have impregnated an ex-girlfriend during the time he and Bristol were broken up. It’s also possible he’s not the father of Lanesia Garcia’s baby at all.

“Levi insists the baby isn’t his, but no one really knows for sure,” a source told RadarOnline. “Levi is one of three possible fathers who were with Lanesia during the probable week of conception.”

What this development means for Levi and Bristol’s reunion - and their plans for a reality show - is unclear. A Palin family rep claims “no official decision has been made” about the engagement.