Kourtney Kardashian and Travis Barker can't keep their hands to themselves! The PDA-happy couple continued their Instagram lovefest in Mexico on Wednesday when the 42-year-old mother of three posted a shot of herself sitting on her 45-year-old drummer boyfriend's lap. In the pic, Kourt is rocking a black-and-white striped cutout dress and strappy heels, not to mention a bold red lip and a wide grin. Barker's face is hidden in his girlfriend's neck as he gives her a kiss. «Yummy,» Kardashian