6 Reasons We're Excited About the Billboard Hot 100 Music Festival

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Billboard kicks off their inaugural Hot 100 Music Festival at Jones Beach Theater in Long Island, New York, on Saturday and with over 40 live acts on three main stages, there's almost too much hotness to keep track! Here's a look at what we're excited for at this summer's end celebration.

1. The Biebs is Back!

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After a stop at Montreal's Beachclub on Saturday, Justin Bieber hits the Hot 100 stage for his first major concert performance since appearing at KIIS FM's Wango Tango Festival back in May.

The pop star will most definitely be showing off his new single "Where Are Ü Now" -- no surprise, as Skrillex goes on right before the Biebs -- and possibly preview new music, including his much-hyped upcoming song, "What Do You Mean?"

NEWS: Ed Sheeran Steps In After Justin Bieber Cancels Festival Appearance

2. Nicki Minaj Wraps The Pinkprint Tour

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If you missed out on Minaj’s worldwide tour in support of her third studio album The Pinkprint, Sunday night on the Hot 100 stage will be your last change to catch in. No word on whether the rapper's boyfriend/opening act Meek Mill will join her onstage, but Young Money head honcho Lil’ Wayne is playing Saturday, so fingers are crossed for an "Only" duet!

3. The Weeknd Stays Hot

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From a Kanye-crashed Coachella set to a guest appearance on Taylor Swift’s 1989 World Tour to his hit song, "I Can’t Feel My Face," (and the flaming-hot music video) taking over the charts, Abel Tesfaye, a.k.a. The Weeknd, is ruling the summer of 2015. His Saturday night set on the Hot 100 stage will be the perfect way to cap off an epic summer.

4. Skrillex Rocks the House

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There's no denying that the dubstep DJ puts on one heck of a live show. His set on the Hot 100 stage before Bieber's Sunday night is not to be missed.

WATCH: The Weeknd Is Literally on Fire in 'Can't Feel My Face' Music Video

5. Ryn Weaver Brings the "OctaHate"

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Weaver's been lighting things up since the release of her debut album The Foolback in June. The charts call her indie-pop, but the 23-year-old singer defies categorization.

"If you know the box that you are in, you are not pushing music hard enough," Weaver told ET earlier this summer. "You're not trying to change things enough, you're not trying to activate things enough. If you know exactly your genre, that means you're doing something that's been done."

Weaver will hit the Beach stage with her hit single "OctaHate" and more on Sunday night.

6. Early Acts

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Don't sleep on the early acts at the Hot 100 Fest. Perrie Edwards and her Little Mix bandmates will take the Hot 100 stage Saturday at 3 p.m., and rapper Fetty Wap, who is riding high on his summer hit "Trap Queen" as well as a recent appearance on Taylor Swift’s 1989 tour, will hit the Beach Stage on Sunday afternoon.

Electro-pop divas Halsey and Kiesza will also be gracing the Hot 100 Fest stages this weekend. Halsey, whose first full-length studio album Badlands officially drops on Aug. 28, will play the Hot 100 stage on Saturday afternoon, and Kiesza will take to the Samsung Level stage on Sunday evening.

Show up early to get a first look at up-and-coming acts like indie pop band MisterWives, who just released their new music video for "Our Own House" last week, and singer Justin Baron, who dropped his new single, "For You," on Thursday.

WATCH: 7 Biggest Surprise Appearances at Coachella: Kanye, Madonna and More!