As always, this week's episode of The Girls Next Door started off with a random sub-plot as Bridget celebrated her dog Wednesday's birthday. Although somewhat pointless, at least this part coincided with the rest of the episode, as the girls celebrated Anastasia's (Bridget's sister) 21st birthday.

To celebrate the big 2-1, the girls went on a road trip with Anastasia and some friends. It wasn't said where their first stop was, but it was entertaining nevertheless. Kendra and Playmate Sara Jean Underwood stopped by some train tracks to flatten pennies… traditional 21st birthday celebration, of course.

The next stop was to Andersen's for their famous pea soup, followed by sightseeing at Bubble Gum Alley, a walkway where people stick their chewed gum on the walls.

As the girls were getting ready for the big night out, Bridget had a surprise in store for Anastasia - her parents. After dinner, Holly found a 9-year-old boy for a dance partner and Kendra found the shots for Anastasia. Needless to say, Anastasia had quite the night mixing all kinds of alcohol.

More pictures: Kendra / Bridget / Holly / Hef

Story by Rebecca Kruse

Starpulse contributing writer