We all know that Taylor Swift's girl squad runs deep, but there has been one girl that has been there since the very beginning: Selena Gomez.

The two became friends in 2008 after both dating the Jonas Brothers and have maintained bestie status ever since, with Selena most recently telling Vogue magazine that Taylor is "my sister."

In celebration of their sisterhood, we decided to look back at the friendship of Taylor and Selena.

Thank the Jo-Bros.

Taylor and Selena became besties back in 2008 when they were both dating the Jonas Brothers (Taylor was dating Joe; Selena was dating Nick). Selena told The Herald Sun that they instantly clicked and they became "best friends."

First red carpet appearance.

Back in 2008, the girls hit the red carpet together at the premiere of "Another Cinderella Story."

Girls night out in London.

In November of 2010, the girls hit the streets of London to take in dinner and a play.

Only positive thoughts.

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Back in 2010, we sat down with Selena to talk about her bestie and she revealed the thing she loves the most about Taylor is that she "focuses on all the positive things."

Selena shows Taylor some birthday love.

When Taylor turned the big 2-1, Selena showered her with some Twitter b-day wishes.

BFF Trophies.

In 2011, both girls wore their best "surprise I won faces" at the American Music Awards.

Justin & Taylor were even friends.

At the 2011 Teen Choice Awards Selena performed her hit "Love You Like A Love Song" and Taylor and Selena's ex-boyfriend, Justin Bieber, were seen dancing along in the crowd.

Taylor gets a Selena temporary tattoo.

During rehearsal for her Speak Now Tour, Taylor wrote the lyrics, "you've got every right to a beautiful life" on her arm, which just so happens to be from Selena's single, "Who Says."

First on-stage performance.

In November 2011, Selena and Taylor took the stage together for the very first time on the Speak Now Tour giving the crowd of Swifties and Selenators a performance of "Who Says."

3-D Fun.

Not sure what was going on here at the 2011 American Music Awards, but it looks like they were having a great time.

Selena's like a sister.

In 2011, Taylor did an interview where she described Selena as a "sister" and as someone who can "predict my thoughts."

Cupcake Parties.

In April of 2012, Selena gathered all her friends together for music, gossiping and cupcakes...lots of cupcakes.

Taylor Swift doesn't approve of Selena's PDA.

In 2013, Taylor had a pretty hilarious moment when she made it quite obvious that she wasn't the biggest fan of Jelena as she was caught backstage sticking out her tongue when they showed a little PDA. Hey, if you're best friend can't be honest about how they feel about your BF, who can?

Mermaid Twins.

Taylor shouts out her "sister" on her 21st birthday back in 2013.

Swapping Secrets.

At the 2013 Video Music Awards, the two were spotted in their seats swapping some serious gossip...at least that's what I hope they were doing.

Cutest couple at the MET Gala.

At the 2014 Met GALA, Taylor and Selena made sure to have some girl time galavanting around the museum as Dean Martin's "Volare" played in the background.

Into the wild.

In 2014, Taylor and Selena became one with nature when they gave us an Instagram documentary of their experience listening to ."coyotes freaking out over a full moon.”

BFF only listening parties.

Selena showed love for Taylor's album 1989, by posting this adorable Instagram picture and in the caption describing their listening parties that took place in the kitchen, "driving on the pch, windows down," and guess what? They were super exclusive that only the two of them were invited.

Rocking out.

In 2014, the BFFs decided to hit up The 1975 concert where they danced and sang along to every single word of the bands song, "The City."

Things got emotional.

At the 2014 American Music Awards, Selena got really emotional performing her single, "The Heart Wants What It Wants"...and so did Taylor.

Swiftie nails.

There isn't a better birthday present than having your BFF paint her nails in honor of you.

Ladies who lunch.

In June 2015, the girls took the streets of Los Angeles looking all sorts of fabulous to grab lunch together.

A few of her favorite things.

Taylor was privileged to hear Selena's "Good For You" before all of us and dubbed it her "favorite" thing Sel has done.

On stage performance Round 2

Sel joined Taylor once again on stage during her 1989 World Tour performing her single, "Good For You" for the very first time.

There's no "Bad Blood"...

Taylor tapped her BFF to star alongside her as her evil nemesis in the "Bad Blood" video. The girls went head-to-head in a fiery battle at the end of the clip, but there was still nothing but love on set.

Just mad love.

Selena's reaction to Taylor winning the 2015 VMA for Video of The Year for "Bad Blood" is just priceless.

Taylor makes you beautiful.

Selena shared this picture on Instagram giving a shout-out to her friend thanking her "for making us and all beautiful women feel beautiful."