What is the name of this song!?

It's been driving me crazy. I saw it once on youtube then lost track of it. It's a duet, a male and female sing it, video is on the beach, they repeat the words 'don't let go' three times, then a real spanish-type music kicks in. It's a very club music sounding song that's been very popular this year. I'm sorry I have no more details but can anyone please help!?