Tori Spelling suffered a wardrobe malfunction during a family vacation Tuesday.

The mother of four was sun tanning with her bikini top untied at the St. Regis Punta Mita resort in Mexico. She stood up before she remembered to tie her top so it fell off as she walked away.

Paparazzi nearby took snaps of Spelling the moment after she realized what happened and immediately covered her breasts with one arm.

See the photos of Tori Spelling's wardrobe malfunction here.

Spelling was in Mexico celebrating her 40th birthday, which fell on May 16. She shared the joys of spending her birthday with her brood on her blog.

"While I could be spending my day in denial, instead I'm on a beach in Mexico celebrating the occasion with my whole fam and my bestie," Spelling wrote official blog. "Because hey, I'm proud of all I've accomplished in these 40 years. In fact, I can't wait for the next four decades. Bring 'em on!"

Spelling and husband Dean McDermott are parents to Finn, 9 months, Liam, 6, Stella, 4, and Hattie, 19 months.

She recently revealed her drastic weight loss less than a year after giving birth to her fourth child. The Craft Wars showed off her toned stomach and fit post-baby body for the cover of Us Weekly magazine in April.

Spelling, who gained 30 pounds during her pregnancy with her fourth child Finn, said she lost that weight plus an additional 15 pounds she acquired over the years with her first three children.

The 5-foot-6-inch star now weighs115 pounds and couldn't be more proud of the hard work she achieved to return to her normal weight following Finn's birth.

She told the magazine, "I feel like I took the weight off safelty and I'm totally happy here."

The former 90120 actress achieved quite a feat- a toned tummy despite receiving doctor's orders that she could not do sit-ups or lunges for at least a year following Finn's birth last August.

"I think my stomach went back pretty well!" she said.

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