You hold: ♠ Q82 ♥ QJ74 ♦ Q83 ♣ AK5

Partner could be overcalling light for the lead, or with some shape, so you cannot commit him to game with this soft, balanced hand. You can make do with an invitational three hearts, though I wouldn’t be surprised if pass were the winner. I would also seriously consider bidding two no-trump with just a slightly better diamond stopper. In my book, the two-diamond call has already guaranteed a heart fit.