Who says you can’t be friendly with your ex? That’s exactly what Katy Perry and John Mayer did at Sabrina Carpenter’s Sunday, Nov. 17 concert in Los Angeles. The duo was spotted by the gossip site DeuxMoi and everything between them seemed warm and pretty low-key for the A-list stars.

Katy Perry and John Mayer proved they've remained on friendly terms a decade after their split, as the former couple reunited at Sabrina Carpenter’s concert in Los Angeles