Rumor has it Governor Sarah Palin's teen mom daughter Bristol and baby daddy Levi are on the rocks -- is it true?

According to Star magazine, it's the tundra truth! The mag reports Bristol, 18, and Levi, 19, are having trouble since the couple welcomed son Tripp in December. Levi's sister Mercede revealed to the mag that Bristol "virtually cut Levi out of the life of their two-month-old son."

Mercede confessed, "Levi tries to visit Tripp every single day, but Bristol makes it nearly impossible. She tells him he can't take the baby to our house because she doesn't want him around 'white trash'!" Bristol won't even allow him to watch the baby for a few hours -- unless he's babysitting!

Sarah Palin's reps released the following statement, "The governor's press office, with rare exceptions, does not discuss the private lives of the governor's family."

For more photos and details, including the hate-filled text message Bristol sent Levi, check out the March 23 issue of Star, on stands now.