At the Del Mar race track, Vicki and Tamra were as thick-as-thieves.

When Jeana decided to gather all the ladies for a private designer label trunk show at her house, Tamra and Vicki couldn't resist trying on different outfits together.

How times have changed: remember when Vicki and Donn invited Simon and Tamra along to Napa to visit a winery and celebrate their anniversary?

During Season 5, Vicki often overstepped her boundaries with Tamra and accused Simon of being overly controlling.

The RHOC Slumber Party! Vicki kicked Donn out of the house for a night of fun (and a psychic!).

The trip to San Francisco turned dramatic when Alexis said grace, and prayed for Briana's health.

Vicki felt that was too personal, and stormed out. Tamra and Briana were right there with her, but convinced her to calm down and return to the restaurant.

Later that season, Tamra confided in Vicki that she found it difficult to manage being a mother and a wife.

What trip to West Palm Beach is complete without riding through the everglades?

When Tamra and Vicky both began to experience challenges in their marriages, their friendship got even closer.

A present for Vicki! Even though they're close, Tamra and Vicki didn't forget etiquette.

When Tamra did break up with Simon, Vicki always came to her defense against Jeana, who took Simon's side.

Soon, it seemed that Vicki's marriage to Donn was breaking down as well, and Vicki revealed what was really going on to Tamra on a wine-tasting adventure.

Ever there for each other, the two lock arms and drink.

Is a girl-talk really a girl-talk if it doesn't take place in a bathroom?

Adorable!

Remember when Tamra would always make fun of Vicki for working too hard, and being late to everything, and then blaming it on work?

Once upon a time, Vicki and Tamra went to Cabo San Lucas for a single-girls get-away of sun and shots.

Vicki couldn't resist chatting up some of the guys in the pool!

Some of their best girl-time lunches were when Vicki could sneak away from work for a while... but they still took place in her office.

Vicki and Tamra were a united front against Peggy's shenanigans.

Double date! Tamra and Eddie grew suspicious of Brooks' intentions from the get-go.

Tamra was always there to open the mail or read texts with Vicki!

When Slade joked about Vicki's looks, Tamra was right there to comfort her and convince her to get back to the party.

Tamra expresses her concern about Brooks.

When Tamra got her implants removed, Vicki was too squeamish to view the results.

Despite their growing tension, Tamra and Vicki managed to keep it civil for Gretchen's burlesque performance.

Post-surgery, Tamra invites Vicki to shop for new bras and tanks with her.

When Vicki announced Briana's eloping with Ryan (despite her anger), Tamra took Briana's side: eloping was OK, but becoming close with Brooks was not.

Costa Rica! Without men and kids around, it seemed like Tamra and Vicki were on the mend.

Only beers can make up for a rough day in the jungle.

"Don't let him tell you what to think!" During Season 7's finale, the tension came to a head when Tamra openly fought with Vicki over Brooks' influence.

When Tamra and Vicki met again at Heather's Clambake, the anger is gone, but the sadness was not.

After a long dinner, the two decided to talk it out...