John Mayer is ready for the next major life milestone as his romance with Kat Stickler continues to heat up. "John is at a point in his life where he is ready to settle down and is looking to seriously date," a source exclusively tells Us Weekly, noting that Mayer, 48, and Stickler, 31, are "getting serious." According to the insider, the pair "spent Thanksgiving weekend together," and Kat has even "been introduced to some of John's friends.