Yeah?
Looks like her to me.
Here is an article from two months ago:
Carla Bruni-Sarkozy, 48, displays her trim figure and VERY pert derriere
You may be right, she just looks different in the pic. If I had to guess, it looks like it was taken in the late ‘80s or early ‘90s. She does keep in shape, obviously, but she looks a bit hard in the face now.