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The men's and women's NCAA Tournaments have finally arrived, meaning it's time for fans to create brackets and watch all the action unfold. But fans aren't the only ones participating. Some of the world's biggest stars, from former U.S. President Barack Obama to "Top Gun: Maverick" actor Glen Powell, are sharing their picks. 

So, before the inevitable shocking upsets and buzzer-beating victories, here's a look at how the celebrity world sees the tournaments playing out. 

This list will be updated, so create a men's and women's bracket of your own while waiting for more. Don't wait too long, though, because both tournaments' First Four games have already begun. The men's tournament will start its first round Thursday with the women's tournament following suit a day later.

Obama has Gonzaga, Kentucky, Arizona and Kansas in his men's Final Four with the Zags topping Arizona in the NCAA Championship. On the women's side, Obama has South Carolina, Stanford and UConn in the Final Four with South Carolina winning it all over the reigning champion Stanford. 

Powell, an Austin native, has his hometown Texas Longhorns in the men's Final Four alongside Gonzaga, Tennessee and Kansas. Not surprisingly, Powell, who plays "Hangman" in "Top Gun: Maverick" -- which hits theaters on May 27 -- has the Longhorns beating Tennessee 72-65 in the NCAA Championship. 

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Fellow "Top Gun: Maverick" star Monica Barbaro shared both of her brackets as well:

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WNBA legend Candace Parker has South Carolina, Baylor and Kentucky in her women's Final Four with South Carolina beating Texas in the NCAA Championship. 

Former NBA guard Nate Robinson has Michigan State and Virginia Tech sneaking into the Final Four with Kansas and Arizona. The three-time Slam Dunk contest winner predicts Arizona will beat the Spartans in the NCAA Championship. 

2022 Amazing Race champion Penn Holderness thinks Gonzaga, Kentucky, Arizona and Auburn are heading to the Final Four. Holderness has the Zags winning it all over Arizona. 

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Late-night host Jimmy Fallon is another Gonzaga believer, and he thinks Stanford's women's team will successfully defend its national title. 

Academy Award-winning actress Octavia Spencer has a bracket of one: her beloved Auburn Tigers. 

WNBA guard Tyasha Harris has faith in her alma mater, South Carolina, to win the women's tournament. She also has Stanford, Baylor and NC State in her Final Four. 

Former NBA player turned social-media presence Rex Chapman has his Kentucky Wildcats in the Final Four, but he doesn't think they'll win it all. Chapman predicts Arizona topping Gonzaga in the NCAA Championship. 

Jay Ellis, who's playing "Payback" in "Top Gun: Maverick," has Kentucky winning the national title over Kansas. Gonzaga and Villanova comprise the rest of Ellis' Final Four. 

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"Top Gun: Maverick" actor Greg Tarzan Davis predicts Gonzaga beating Arizona in the NCAA Championship with UCLA and Auburn joining them in the Final Four.

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Danny Ramirez, who portrays "Fanboy" in "Top Gun: Maverick," shared both of his brackets:

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