Mark Ballas the grove sunglasses sweats

Mark Ballas has never looked happier!

The Dancing With the Stars pro, wearing an orange hooded sweatshirt and Adidas pants, walked hand in hand with his stunning girlfriend Tiffany Dunn at The Grove in LA.

We're lovin' Tiff's studded cut-off denim shorts. If we were holding on to the sexy blonde, we'd be smiling, too!

See more of the twosome looking oh-so-happy in the gallery below.