Celebrity April Fools' Pranks: How Hollywood's Getting In on the Action

It's the one time of year entertainment reporters dread: April Fools' Day.

There's nothing worse than getting a rush of excitement over some news that seems too crazy to believe, only to realize that's exactly what it is, as celebrities get in on the pranking action.

Thanks to the access social media provides to stars' personal lives, it's easier than ever for them to trick their fans and followers about engagements, baby news (which is really frowned upon but still happens) and new gigs.

Here's how Hollywood's trying to pull the wool over our eyes this year -- we'll keep updating this post as new pranks come in.

Even though it's considered a big no-no and insensitive to those who struggle with fertility, a few stars decided it was still a good idea to fake a pregnancy for April Fools'.

There's backlash literally every time someone does this, which Claudia Jordan and Brandi Glanville -- who pulled her sonogram photo down -- will likely find out the hard way.

Justin Bieber also posted a sonogram picture that can be easily found on Google Images with no caption. Hailey Baldwin commented by writing, "very funny..." He then shared more photos of Hailey in a hospital room with the caption, "If U thought it was April fools."

Eventually, he posted a third photo confirming it was all a joke.

Over on her website, Ronda Rousey revealed plans to leave the WWE to pursue "a passion that's been with Ronda for her entire life": Jazz.

She announced the move with a four-minute YouTube video, where's she's seen playing the sax for her wrestling family.

Tom Brady joined Twitter today with one shocking tweet announcing his retirement. He followed it up about an hour later by tweeting, "Was this a bad joke?"

After his Super Bowl win this year the Patriots' QB said he said he'll hang up his helmet when he feels like he's "had enough," adding, "I don't quite feel like that yet."

Both Marvel and DC faked out their fans with separate tactics on Monday.

First, DC posted a trailer purporting to be for the already-announced-but-not-yet-filmed "Aquaman 2." After flashing the title to a Jason Momoa sequel, a trailer for "Shazam" begins playing out instead. Rude!

Mark Ruffalo also teased everyone anxiously awaiting any intel about "Avengers: Endgame" by posting what he called a "spoiler" video on Twitter. All we got: a buffering GIF.

Jennifer Garner took to Instagram this morning to announce she has a book coming out called "Bless Your Heart."

"I'm thrilled and finally able to share with all of you," she wrote. "I've written a book! This whole process has been humbling and illuminating, taking me deep into places I didn't even know I could go. Thank you to every one who helped bring these stories to life and held my hand along the way. The time has come for me to share it—I can't wait to hear what you think."

She eventually updated the caption to add, "Thank you for being so happy for me. Your sweetness makes me feel 🙈😬 🔥 for playing a joke. But this is an April Fool's."

As for what should have been a giveaway: the fact the book's cover said the forward was written by "my therapist."

Countess Luann de Lesseps announced she'd be leaving New York City for Los Angeles, "indefinitely."

Alongside a photo of her over the City of Angels, she added, "I hope the Beverly Hills ladies are ready," along with a winking emoji.

Clearly sensing the joke, Bethenny Frankel commented by writing, "And I'm pregnant with Tom's baby." Tom, of course, is Lu's ex-husband Tom D'agostino.

While we're all waiting for a "Buffy the Vampire Slayer" revival to happen, Sarah Michelle Gellar joked that another show from her past would be returning to the small screen.

Anyone remember "Swan's Crossing"? Well, according to SMG, "Sydney Rutledge is all grown up."

Okay, we don't know if this one is 100% a joke, but his upper lip looks a little Photoshopped to our untrained eye. What do you think, did he do the deed and finally shave his stache?

Please, US Open, can we make this one happen?