Over the holidays, the actress – who celebrated her milestone birthday in November – attended a week-long bikini boot camp at the Amansala eco-chic resort and spa in Talum, Mexico, where she was photographed completely slathered in mud. Wearing only a patterned string bikini, the mom of three was decidedly unglamorous as she plopped down right on the beach, reclining her famously toned body on the sand. For the group activity, Moore was completely covered in mud, which is known to improve skin complexion and relax muscle aches and pains, including her hair, which was pulled back into a messy bun.

[Related: Celebs Flaunt Their Bikini Bods Over the Holidays]

“She put all the twenty and thirty year old women to shame and showed us she still has got it going on,” a spokesperson for the boot camp noted on Facebook. Adding that despite a report in the tabloidStar, she wasn’t “partying and on the prowl,” but “working out, eating super healthy, and relaxing.”

(Coleman-Rayman)

Moore certainly needed to recharge when she headed to Mexico in late December for boot camp, which is described on the resort’s website as “a weight loss vacation, yoga retreat, and fitness holiday, but with so much more.” After starting off 2012 being hospitalized and subsequently being treated in rehab, her year ended with her estranged husband, Ashton Kutcher, 34, filing for divorce and areported fling with 26-year-old Vito Schnabel fizzling before it really started.

[Related: Demi Moore Lets Loose in Miami]

One thing Moore’s Mexican detox didn’t get rid of, however, is her attraction toward younger men. Since she returned from boot camp, she has been spending time with 31-year-old Harry Morton, who founded the Pink Taco restaurant chain – and also dated Lindsay Lohan. While People magazinereports the two are “dating” with E! corroborating the story and noting that it has been going on "for a few months," TMZ says it’s “platonic” right now though “neither party is ruling out the possibility of dating in the future.” - Yahoo