Most celebrities who pose for magazine covers are relieved to have a little help from the Photoshop fairy. No big deal, right? Well, for Lance Armstrong, it is a big deal. It's a BFD!

The seven-time Tour de France winner is pretty P.O.'d about his appearance on the July cover of Outside magazine, which left him asking WTF? when he saw that some tweaks had been made to the T-shirt he was wearing on the photo shoot.

Armstrong posed for the issue in a pair of jeans and a plain blue tee, but the cover shows the shirt emblazoned with "38 BFD," a reference to the cyclist's age and perhaps the fact that it doesn't matter, reports WWD.

But it does matter to Armstrong, who apparently is a bit testy about the fact that he's racing toward the big 4-0. And so, like any good celebrity, he fought back by going straight to Twitter!

"Just saw the cover of the new Outside mag w/ yours truly on it. Nice photoshop on a plain t-shirt guys," he tweeted yesterday. "That's some lame bulls---. #weak."

An Outside spokeswoman was quick to point out that the altered cover does include the note "NOT Armstrong's real T-shirt," but it remains to be seen whether Armstrong is still saying OMG.

In related news, read what Bravo's "Double Exposure" star photographers have to say about Photoshop.