John Mayer and social media star Kat Stickler 'hit it off' earlier this month, according to an ET source, and they're 'seeing where things go.' Kat's last public relationship was with Bachelor Nation star Jason Tartick. She also has a 5-year-old daughter with her ex-husband, Mike Sticker. John has a star-studded romantic history, which includes Taylor Swift, Jennifer Aniston, Katy Perry, Minka Kelly, Jessica Simpson and Jennifer Love Hewitt. Source