Lindsey Vonn 'Cheating' on Tiger Woods with Kris Humphries? Sexy Olympic Skier 'Two-Timing' Pro Golfer with Pregnant Kim Kardashian's Ex-Hubby

Tiger Woods and Lindsey Vonn just "officially" came out as sports nation's newest celebrity couple... and already shady cheating rumors are swirling on the web! According to a recent report in Star magazine, the sexy Olympic skier is currently "two-timing" her pro-golfer beau with none-other-than Kim Kardashian's ex-hubby, Kris Humphries! Apparently, the Brooklyn Nets star is "devastated" that Vonn took things to the next level with Woods - he was hoping their little sexual fling would eventually turn into something more serious! Read on for more details...

Although Woods and Vonn have been romantically linked for months, the former World No. 1 finally made their relationship "Facebook official" earlier in March. He wrote:

"This season has been great so far and I'm happy with my wins at Torrey and Doral. 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... We thank you for your support and for respecting our privacy. We want to continue our relationship, privately, as an ordinary couple and continue to compete as athletes."

But according to a seedy report in the popular gossip tabloid Star, 37-year-old Woods "may have another epic cheating scandal on his hands" - Vonn has been two-timing him with another infamous athlete, Kris Humphries. Apparently, the 28-year-old snow bunny was hooking up with Kim K's former flame over the past eight months, "even after Tiger was in the picture."

The mag goes on to explain that Humphries is "heartbroken" that the two are officially dating now - he allegedly hoped that his own rendezvous with the blonde bombshell would eventually "become more serious."

"He felt a close connection with her," an alleged insider reveals.

That's the only credible "sourcing" Star provides.

But according to another Gossip Cop insider close to Vonn, the seedy cheating report is a "complete fabrication."

So, what do Mstars fans believe?