Diamond Dallas Page Throws Girlfriend 'Surprise' Wedding

Forget surprise birthday parties -- former wrestling superstar Diamond Dallas Page just one-upped that with a surprise WEDDING with his girlfriend, Payge McMahon, in Tennessee ... and TMZ Sports has the pics!!!

We're told the ceremony took place at the Dwell Hotel in Chattanooga ... with the newlyweds wearing a lovely red and white ensemble that complemented one another.

But get this -- Diamond originally told McMahon they were going to a "red and white" Christmas party ... but to her surprise, she was actually getting all dressed up to attend her own wedding!!

As for why he chose Chattanooga, DDP says that he and Payge reunited there after 6 years on December 9th, 2019 ... and that his time…