Celebrities Sing Happy 80th Birthday to Willie Nelson [VIDEOS]

No one really knows when Willie Nelson's birthday is.  According to Wikipedia, it's tomorrow.  According to Willie's Facebook page, it's today.  Either way, Happy 80th birthday Willie.  And we're not the only one's with well wishes for Willie's big day.  Check out these stars birthday tributes, including Sponge Bob Square Pants.

Watch more celebrity birthday wishes at Willie's YouTube channel.

Willie celebrated his birthday by giving back.  He turned his Texas show into a charity event for the victims of the plant explosion.