If the music industry was high school, Post Malone would most definitely be voted "most popular". He's THAT guy...the one who is able to befriend anyone, from the jocks to the valedictorian to the party guys.

He is the enigma of the music industry. His music crosses over hip-hop and R&B, with tinges of rock and roll and the blues, but also has pop's easy-to-listen-to appeal. Naturally, his collaborations also cross over, as he's worked with the likes of pop icon, Justin Bieber, Quavo from Migos and rock-and-roll shock artist, Ozzy Osbourne. He's making friends with almost everyone in the industry along the way.

Here are 20 photos that showcase the chart-topping superstar with all his celebrity homies, from different genres and industries.

20 Post Malone and Billie Eilish

When this photo of Post Malone and Billie Eilish hugging made the rounds on the Internet, people were quick to suspect the two were dating, which is not true. The two are just good (and very successful) friends, who headlined the Hangout Music Festival in Alabama, along with the Red Hot Chili Peppers.

19 Post Malone and Justin Bieber

At first glance, pop superstar, Justin Bieber, seems like an unlikely friend for Post Malone, but the two are actually quite close. They made their friendship 'Instagram official' in 2016 and soon after released their chart-topping hit, "Deja Vu".

Apparently, the two are so close, Post was put in charge of putting together Justin Bieber's bachelor party when he got engaged to Hailey Baldwin.

18 Post Malone and 21 Savage

"Beerbongs & Bentleys" marked the sophomore album release of Post Malone, featuring collaborations with the likes of 21 Savage, G-Eazy and Nicki Minaj. The lead single from the album, "Rockstar", with 21 Savage, topped the charts. These two face-tattooed artists went on to win "Song of the Year" at the MTV VMAs.

17 Post Malone and Jaylon Smith

Cowboys fan, Post Malone, got to meet Jaylon Smith, who presented the singer with an official 'Hot Boyz' blinged-out chain. Post's father is the assistant director of food & beverages for the Cowboys. It's sweet to see things come full circle for the Post family.

16 Post Malone and Billie Joe Armstrong

Billie Joe Armstrong, of the iconic punk rock band, Green Day, stopped by backstage at a show Post Malone was headlining in Oakland. From one legend to another, Post passed on his knowledge of beer pong to the rock-and-roll legend. Photographer Grady Brannan posted the fun on Instagram, including blue Solo cups and Bud Light.

15 Post Malone and J Balvin

Columbian reggaeton artist, J Balvin, whose music has steadily climbed the charts, features the likes of Cardi B and Bad Bunny. Balvin expressed his desire to work with Post Malone in an interview. Post returned the sentiment by featuring J Balvin in his music video for "Wow".

14 Post Malone and DJ Khaled

DJ Khaled, the famed producer (and Internet personality), released his 11th album last year, "Father of Asahd", which featured a roster of musical talent, including Post Malone. The two collaborated on "Celebrate", which also featured rapper, Travis Scott.

13 Post Malone and Jimmy Fallon

When Post Malone found out that Jimmy Fallon had never tasted the delicious 'endless breadsticks' and pasta at the 'carb heaven' known as Olive Garden, the two teamed up to film a segment. The segment featured Jimmy trying out Olive Garden for the first time.

In the segment, the two have the greatest time sampling free wine, breadsticks and salads, along with a complimentary birthday cake.

12 Post Malone and Liam Payne

Post Malone slid into Liam Payne's DMs one night, saying, "I love you" to the ex-One Direction member, who previously covered Post's hit song, "Circles". This led to Post reaching out to share thanks.

The anecdote was revealed when Liam was a guest on The Tonight Show Starring Jimmy Fallon, where he also said he would love to collaborate with the singer. Jimmy advised him to take him to Olive Garden to get the ball rolling.

11 Post Malone and Dennis Rodman

Another surprising friend of Post Malone is ex-basketball star and ex-tabloid favorite, Dennis Rodman, who gave the singer a $25 Olive Garden gift card for Christmas. According to Jimmy Fallon, Post celebrates all his big life moments at the pasta chain, so it was a perfectly thoughtful holiday gift.