Lil wayne and taylor swift?

a friend of a friends showed me this song the other day its a slower song with little wayne and it has taylor swift in the background, they obviously didnt make the song together they changed her voice so that the pitch was a bit higher in her voice but i absolutely loved it and i cant remember any of the lyrics and ive tried to google it and youtube it and i have found absolutely nothing!? please tell me someone knows the name of the song or where i can find it! thanks!!