Big Brother will introduce 16 new houseguests to viewers when Season 21 kicks off on CBS tonight, however you can get to know the Big Brother 21 houseguests right now.

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The Summer 2019 edition of Big Brother, once again hosted by Julie Chen, will premiere with a two-night event on Tuesday, June 25 and Wednesday, June 26 from 8-9PM ET/PT on CBS.

Following the first two episodes of the new season, Big Brother will air a one-hour broadcast on Sunday, June 30 at 8PM ET/PT, and then will continue to air three episodes every week for the rest of the summer.

In addition, Big Brother's 24/7 online live feeds will go live Wednesday, June 26 at 9PM ET, and Big Brother: After Dark will air nightly on Pop beginning Wednesday, June 26 at 12AM ET.

Big Brother 21's new houseguests are from all across America, with each person bringing his or her own unique look, background, set of skills, and personality traits to the table.

Included among Big Brother's Season 21 houseguests are a preschool aide, a Broadway performer, a petroleum engineer, a therapist, and a truck driver.

And what would a Big Brother cast be without a few models and fitness trainer types?

Big Brother's Season 21 cast also includes Holly Allen, the ex-girlfriend of former The Bachelorette and The Bachelor: Winter Games bachelor Luke Pell.

Holly was the on-again, off-again girlfriend Luke reconciled with last year and used as the explanation for why he "ghosted" on Stassi Yaramchuk immediately following their appearance on The Bachelor Winter Games.

After three months of broadcasts, Big Brother's 21st season will conclude with a special 90-minute live finale on Wednesday, September 25 at 9:30PM ET/PT, immediately after the special 90-minute premiere of Survivor: Island of the Idols, the 39th season of Survivor.

Click the BEGIN GALLERY link below to view photos and descriptions of Big Brother's Season 21 houseguests and learn more about them before the season premieres on CBS tonight!

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