Hollywood's Best Girlfriends! No one has your back in Tinseltown like a best friend. Check out which strong women these A-listers can really count on.

Jessica Simpson & Eva Longoria:

Credit hairstylist Ken Pavés for matching up these lovelies from the Lone Star state at August's MTV Video Music Awards. "I introduced them because I find their beauty inspiring," Pavés tells Us of clients Jessica Simpson, 26, and Eva Longoria, 31, "but I find their compassion toward others even more inspiring." Says a Simpson source of the singer's steady club wingman: "Jess and Eva are best buds. They're just real tight." After hanging in at Hyde on June 20, Longoria hit Moonlight Rollerway in Glendale, California, June 23 to cameo in Simpson's "A Public Affair" video with Christina Applegate. "It was great working with these talented ladies," Simpson tells Us. "Even if you don't like me, you will want to watch this video for the hot girls."

Leah Remini & Jennifer Lopez:

Who does Jennifer Lopez, 36, call when she needs a girls' day out? King of Queens' Leah Remini, 36, a longtime pal of Lopez's hubby, Marc Anthony. "They're very girlie together," a source tells Us. "Constantly laughing." When they're not shopping at Beverly Hills boutiques (they checked out Madison May 30), they like to karaoke and drop by a psychic's parlor for a reading. "Leah loves to take her," the pal says. "Jen gets a big kick out of it." And Anthony approves, the source says, "because Leah has a good head on her shoulders."

Liv Tyler & Kate Hudson:

They're with the band! Kate Hudson, 27, and Liv Tyler, 29, logged serious bonding time accompanying their respective rocker loves (Chris Robinson of the Black Crowes and Royston Langdon formerly of Spacehog) on tour together in 2001. The duo are both raising toddler sons in NYC's West Village, but they still party: On June 19, they hung out all night on the patio of L.A.'s Chateau Marmont. Tyler's take on her You, Me and Dupree pal? "There's something magical and special about her.... She sparkles."

Jennifer Aniston & Courteney Cox:

Courteney is so caring, she's the best friend to Jen," Surreal Life star Alexis Arquette has told Us of what keeps sister-in-law Courteney Cox, 42, and Jennifer Aniston, 37, close. Of all her Friends pals, "Courteney, of course, is the one I see just all the time," Aniston recently said. And it was Cox, a source tells Us, who told Aniston's beau, Vince Vaughn, 36, to buy a ring "and just propose. She will say yes. You just need to go for it."

Hilary Swank & Mariska Hargitay:

They both feel so lucky to have each other," a mutual pal tells Us of BFFs Hilary Swank, 31, and Mariska Hargitay, 42. "They're such good friends because they both have brains. It is a mature, deep friendship based on reality and no BS." But they do have their lighter moments: Swank has popped by for charades nights with Hargitay and hubby Peter Hermann.

USWeekly Via ONTD