Careful, Brooke!

Charlie Sheen's stunning ex-wife enjoyed a posh dinner at Sushi Ike in Hollywood with her new boyfriend, country star Jaron Lowenstein, but she appeared to be having a bit of trouble with her sexy high-heeled boots!

Miss Mueller looked hippie-chic in tan leather pants, a loose-fitting blouse, piles of turquoise jewelry and a pretty crystal headband, so it's a shame those shoes caused a minor slip-up.

The busy mom-of-two has been embracing the rugged look every since hooking up with her new country singing beau, and it was actually Sheen who introduced the pair while they were in the process of reconciling.

Later, the pair shared a romantic kiss -- they make such a beautiful couple!

Brooke Mueller Jaron Lowenstein Kissing Piano Bar boots