Jennifer Aniston looks like the all-American girl-next-door in her latest ad campaign for smartwater. Credit: Mark Seliger/Courtesy of smartwater

Things are looking up for Jennifer Aniston! The star embodies her all-American, girl-next-door persona in the latest ad campaign for smartwater.

The longtime company spokesperson, 45, looks right at home, standing against a blue sky in a pair of blue jeans and white tank top, which hug her enviable figure.

In the campaign, the Friends alum looks sunny and natural, sporting sandy streaks of hair color offsetting her world-famous blonde tresses. Justin Theroux's fiancee swings the smartwater bottle over her shoulder and slightly smiles in the image taken by celebrity photographer Mark Seliger.

Aniston has fronted the L.A. brand since 2007; her latest campaign photo is smartwater's second shot in bursts of color. Smartwater's new campaign coincides with the launch of its revamped website, which touts itself as a "refuge of calm serenity as guests are whisked through the clouds."

The We're the Millers actress is, after all, one of the most zen celebrities in Hollywood. Aniston turns to yoga to unwind and work out, under the guidance of her longtime instructor Mandy Ingber. She also decompresses from her busy schedule with frequent visits to the spa, dates with celebrity pals like Chelsea Handler, and of course, alone time with her man.

Tell Us: What do you think of her new ad?