Awkward!!! Katy Perry finally (kinda) broke her silence on her romance with Justin Trudeau on Monday night - and she did it right in front of her ex! OMG! As we covered, Katy was performing her Lifetimes Tour at London's O2 Arena on Monday night. She brought a fan on stage who unexpectedly proposed to her after hearing she was "single"! But that fan apparently wasn't online leading up to the concert! Related: Blac Chyna & Rob Kardashian BACK TOGETHER? Hours before the show, sexy snaps of the singer making out with the former Canadian Prime Minister on a yacht hit the internet! The couple first...