Olly Murs just can't keep his cool when it comes to Jennifer Lawrence. After revealing that he has a crush on the Oscar winner during a BBC Radio 1 interview a few weeks ago, the British singer (behind hits like "Troublemaker") was invited to sit down with the star and her Hunger Games castmates. Murs, 31, didn't waste any time when it came to flirting with Lawrence – especially after Radio 1 host Nick Grimshaw dubbed him as the "biggest Jennifer Lawrence fan in the world." "You are?" Lawrence, 25, asked, feigning shock over Murs being obviously starstuck. "You've virtually ignored me since I got here."