The pair bonded well while shooting "Valentine's Day", and Roberts, 45, has now taken the 23-year-old singer under her wing, reported Showbiz spy.
"When they met, Julia was blown away by Taylor's talent and beauty. They've stayed in casual touch, and Julia's three kids have become big fans of Taylor's music.
"Julia sees a lot of herself in Taylor, so she reached out to her recently to catch up and offer some life advice. Julia's counseling Taylor on how to find the right guy and how to spot warning signs when relationships go bad. She's even suggested that, in the future, Taylor steer clear of dating well-known singers and actors," a source said.