WELTERWEIGHT champion Georges St Pierre is reportedly dating American singer Mandy Moore.

According to Star Magazine, Moore, 24, has a huge crush on French-Canadian fighter St Pierre, 26, after watching the grappler compete in the Octagon.

Singer turned actress Moore attended UFC 83 in Montreal, Canada, and saw St Pierre re-capture the UFC gold from American fighter Matt Serra.

One onlooker at the event said: "She was going crazy as Georges was beating his opponent. She was jumping up and down and having a great time."

The source revealed the pair met up after the event and it is not th first time the two have been seen in each other's company.

The insider added: ""Georges was overheard saying that he would love to date her!"

Take a look at our slideshow of pictures to see why GSP is so attracted to Mandy Moore...