Proving that the single life can do a body good, Katie Holmes stripped down to her bikini for a brand new ad campaign with IRIS jewelry.

The 34-year-old actress rocked the gorgeous sparklers on a sandy beach while her beautiful brunette locks tousled in the wind.

In related news, Miss Holmes was on hand for the The New York Observer's 25th Anniversary Party at the Four Seasons restaurant and looked stunning in a black Dolce & Gabbana dress.

While enjoying the company of her fellow industry pals, the “Batman Begins” beauty shared a few fashion tips with Us Weekly.

"I rely on my friends to inspire and lead me in the right direction and tell me when it's not working,” Katie explained. “I always love an A-line skirt and wide-legged pants. They're helpful!"