Jo Bros popped in to see 'grandpa' Letterman to spill about their 'famous relationships'...

Jonas Brothers dropped by the David Letterman show and were asked some pretty awkward questions!

David Letterman asked them the usual questions we've all heard a million times like how they formed the group and how they cope with all the screaming girls, but at the end, he got a bit more personal.

The Jonas brothers dished the dirt on what went wrong with Nick and Miley and Joe's relationship with Taylor Swift....eeeeek!

Watch their revealing interview...

Do you think the Jo Bros should keep quiet about Miley and Taylor, or are they still perfect gentlemen?