There’s something about Megan: Can you spot the difference? Has the screen stunner gone under the knife or is she just retaining a little water — in the lips?

Things are changing in the Megan Fox Face Department.

The men’s mag favorite, 24, stepped out for last week’s Hollywood premiere of Jonah Hex looking a little different from her much-photographed former self. We’ll let you be the judge… has Megan’s been tinkering with what her mama gave her?

“Megan was so naturally sexy – that’s why she was considered the best-looking woman on Earth,” a Hollywood insider told The Sun. “But recently she’s looked too skinny, stiff and a little fake.”