Justin Timberlake has not only offered to write Ellen DeGeneres' wedding song to Portia De Rossi, he's even offered to perform for the special event.

JT was among the first to congratulate the couple when he appeared on Ellen. When Ellen suggested he should marry his girlfriend Jessica Biel, he laughed it off but said, "No... but I'll sing at your wedding."

He added, "You should have an original wedding song; I think it's only fitting. "(Write down) everything you want to say to Portia and everything you wanna say to Ellen... and I'll put it to music and it'll be amazing."
http://www.hollyscoop.com/justin-timberlake/justin-timberlake-to-perform...