Luke Evans treated his IG fans to a thirst trap ... after shedding 17lbs in just 10 weeks. The actor showed off his rippling abs in a scorchin' hot IG clip Monday ... rocking nothing but a pair of light wash torso-enhancing jeans. Luke spilled the tea on his weight loss journey ... attributing it to the high-energy hustle of his West End role as the late Queen Mother's steward, William Tallon, in "Backstairs Billy" at London's Duke Of York theatre. "Wanna burn body fat fast? DO A WEST END SHOW!!! Dropped 8kg in 10 weeks!! Only down side… it's BLOODY WINTER
