Posted on Wed Jun 13, 2012 06:00 AM PDT
Her character on Mad Men was constantly struggling with her massive weight gain this season, but in real life, nothing could be further from the truth for January Jones!
The X-Men: First Class star showed off her slender post-baby 'bod in white pants and a low-cut tank as she headed to a pilates class in Los Feliz, on Tuesday afternoon.
Jones gave birth to son Xander last September, and while she's yet to reveal the identity of the baby daddy, we spotted the single star wearing a gold band on her wedding ring finger last week. Is it just a fun fashion accessory, or is Jan keeping another big secret?
Do you think Jones' baby daddy is Jason Sudeikis?
SEE THE GALLERY January Jones Heads To Pilates
January Jones Brunches With Her Baby Boy - Jun 26, 2012
January Jones Kick-Starts Her Day With Pilates - Jun 23, 2012
January Jones Is Red-Dy To Shop! - Jun 21, 2012
January Jones Is A Red Hot Mama - Jun 19, 2012
January Jones: Bell Bottom Betty! - Jun 13, 2012