Jessica and Ashlee Simpson got their party on Friday night at The Nice Guy in West Hollywood, escorted by their husbands, Eric Johnson and Evan Ross. Parents' night out!

Leaving the little ones at home, Jess broke out a sexy see-through dress with black lingerie underneath, while Ashlee opted for her usual, more understated look with a black top and black jeans and long silk trench.

Eric had a firm hold on Jessica's hand as she made her way down the steps to their car, in 5-inch heels. Fortunately no one took tumble! Although our YouTube page probably would have exploded, had Jess face-planted on her way out :)