The reigning females in their respective fields, Bey and Nick have not only stick together musically (like on "Feelin' Myself" or their "***Flawless" remix), but frequently go on double dates and share love advice.

While Kesha battles against her producer and record label for freedom, Lady Gaga has been her most vocal supporter and strongest ally. Gaga has been giving Kesha shoutouts in interviews and spending time with her like a good gal pal does.

From performing on tour r to sharing magazine covers, Charli XCX and Halsey lift each other and always bring a strong sense of girl power to whatever they do.

Selena and Taylor may have met through their Jonas Brother exes (Nick and Joe, respectively,) but BFFs this tight can't be defined by any number of notable ex-boyfriends (of which these two certainly have a few.) Their support for each other prevails through heartbreak, crazy careers, and evidently, goofing off in 3D glasses.

Seemingly put together by the heavens, you'd be hard-pressed to find a girl group that gets along better and seems more in-sync than LM. While most female acts are torn apart by solo ambitions, the Little Mix ladies are going stronger than ever after three albums together and seem keen to keep it that way.

Nothing says best friends like relentlessly touching each other's naughty parts. When Iggy Azalea stopped by Fuse to talk about working on "Black Widow" with gal pal Rita Ora, the rapper said, "She touches my butt all the time...Rita is just always harassing my butt. But she has boobs and I don't have any boobs. That's why we make an awesome duo."

Despite having the same last name, the Civil Wars and Paramore singers aren't related. But they have been close as hell for more than a decade. The duo parlayed their musical friendship into a gorgeous re-work of the Paramore ballad "Hate to See Your Heart Break," released on the deluxe version of the band's self-titled album.

The controversial stars initially connected when Love tweeted Lana about her cover of Nirvana's "Heart-Shaped Box," asking the Ultraviolence singer if she knew "song is about [her] vagina." They've since hit events together, and the Hole singer will even join Del Rey for eight stops on her upcoming tour.

T-Swift seems to collect gal pals even quicker than she rifles through boyfriends. (Not that either of those things are bad, of course.) Her latest BFF is everyone's favorite Kiwi wunderkind Lorde, making for a pairing that is as unexpected as it is awesome.

If you're lucky, you'll catch these British beauts arm-in-arm on the party circuit Stateside or in their native U.K. And if you were really lucky, you caught Marina and Charli's joint U.S. tour. You know what they say: Friends who tour together, stick together.

Mariah and Da Brat go way back, both personally and professionally. Brat hopped on numerous remix tracks for Mariah over the years, from "Always Be My Baby" to "Heartbreaker" to "Loverboy," and she even had a role in the 2001 movie Glitter. The two are still tight today, as Brat is said to be included on Mariah's forthcoming fourteenth(!)  studio album.

Annie of St. Vincent + Carrie of Sleater-Kinney/Wild Flag = Indie Rock Dream Duo. You guys wanna grab some vegan pizza and watch Portlandia?

It doesn't get much more awesome and adorable than these two U.K. songstresses. Judging by their zillions of photos together (seriously, are you guys always hanging out?) they never seem to be having anything less than a spectacular time.

The K-pop scene is filled with girl groups that act like sisters, but we have a soft spot for 2NE1 members CL and Dara, mainly stemming from one heartfelt story. When the group was in Japan during the 9.0-magnitude, Tohoku earthquake and tsunami in 2011, Dara quickly called her pal and group leader. Even as the building was shaking, CL came to get her, walking down 34 flights together.

The "Q.U.E.E.N." collaborators are each individual forces to be reckoned with, but together they are a duo of superpowerful proportions. Monáe talks about Badu as a mentor and inspiration, and credits her with helping to get her career off the ground. Badu has said of Monáe, "I love her mind. Our music is nothing alike, but we have a kindred thing." Follow them on Twitter and you'll see the two often refer to each other as "twin."

As collaborators, tour mates, and crucial female rap pioneers- they are the only two women to have at least three platinum rap albums -it only makes sense that these two have such a strong bond.

Despite having seemingly opposite personalities, the Girls' Generation members speak publicly about their friendship with the typically reserved Taeyeon once tearing up talking about Tiff: "What words do I need? She's a friend I need no matter what."

Never mind that Miranda Lambert's husband Blake Shelton initially bonded with The Voice star RaeLynn—the country diva has found her own love for the singer. "I call her my mom," RaeLynn told Fuse of Lambert, who brought the rising country singer on her latest tour. "But she didn't like that so I call her 'sister-mom.'"

These O.G. riot grrrls helped kickstart a feminist punk revolution in the 1990s with Bikini Kill. More than 20 years later, they are certifiable punk icons, still kicking ass and rocking out in The Julie Ruin.

Demi and Selena have seen some ups and downs since the Disney channel days, but their roots run deep. After falling out for a couple of years, Demi says the two have patched things up and that her gal pal "will always be really, really close to my heart."

Missy first befriended the late R&B icon in 1996 after they collaborated on Aaliyah's album One in a Million, and they were inseparable from then on, up until the singer's tragic death in 2001. They even recorded a song together called "Best Friends."