Tiger Woods & Lindsey Vonn -- Yes, We're Banging

Tiger Woods and Lindsey Vonn just admitted what we've all known for weeks -- they are dating ... and they've already posed for the kind of cheesy couple photos normally reserved for people about to get married.

Tiger and Lindsey each posted the dating confession on their Twitter and Facebook pages. Tiger's said ... "Something nice that's happened off the course was meeting Lindsey Vonn. Lindsey and I have been friends for some time, but over the last few months we have become very close and are now dating."

Lindsey posted a very similar comment ... "Our relationship evolved from a friendship into something more over these past few months and it has made me very happy."

But the best part of their coming out is definitely the corny photo shoot.