Katy Perry might not be kissing and telling ... but she seemingly hinted at her romance with Justin Trudeau while being proposed to on stage during her concert Monday night!

Check out this fun clip from KP's 'Lifetimes Tour' show in London ... a fan fully gets down on one knee with his handmade sign to ask for her hand in marriage. Katy has a telling respone, smartly replying ... "You really should have asked me about 48 hours ago." TikTok/@charl_robbins

ICYMI, a day prior to the surprise proposal ... we published photos of her and the former Canadian Prime Minister packing on the PDA on a yacht off the coast of Santa Barbara, California in late September. Play video content

Their handsy rendezvous came weeks after Justin was seen cheesing hard at her 'Lifetimes' s

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