Ariana Grande performed in Miami last night, and a few minutes into her hit "Love Me Harder," the Biebs joined her onstage. He's certainly used to belting it out in front of thousands of screaming fans, so we were shocked to see that he totally blanked on the lyrics in the middle of the song!

In his defense, it's not his song, and afterwards he apologized, saying that he studied the lyrics before the show. Bieber also tweeted, "Thank you @ArianaGrande and thank you Miami. I missed the stage. See u soon ;)"

Still, Ariana sounded fantastic and Bieber's "I forgot the words" dance moves were pretty awesome ... check it out in the video above!

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Angelina Jolie wasn't the only famous mom at the 2015 Kids' Choice Awards last night!

Katie Holmes was also at the star-studded awards show with her daughter Suri Cruise, and the ladies clearly had a blast. Suri wore a denim vest and a pink dress, and she showed off a bright pink manicure and toted a small Chanel bag. We're willing to bet money that Suri picked this out herself -- and maybe she chose her mom's outfit as well? Katie DID look pretty good last night! The actress laughed as her daughter scooped up confetti and stuffed it into her purse at the end of the show, and we also got a peek at what looks like a gold crown in Suri's mouth. Is that real?!

Suri's dad Tom Cruise wasn't anywhere to be seen, but Jamie Foxx, who Katie has reportedly been secretly dating for years, was at the event to present Emma Stone with the award for Favorite Movie Actress for her work in The Amazing Spider-Man 2. In addition to Jolie, stars like Jennifer Lopez and Iggy Azalea were also at the show ... and Iggy's dress was so fancy, we couldn't even fit it all in the same frame!

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Angelina Jolie attended the 2015 Nickelodeon Kids' Choice Awards last night, and she brought daughters Shiloh and Zahara as her guests!

The trio posed for pictures inside The Forum in Inglewood, and they even sidled up next to Meghan Trainor for a snapshot. Angelina may be one of the biggest names in showbiz, but she's also one of the coolest moms in town!

Angie won the award for Favorite Villain for her role in Maleficent (she was also nominated for Favorite Movie Actress, but she lost out to Emma Stone), and when she hit the stage to accept her trophy, she hugged her girls and gave an awesome speech about learning to embrace your differences.

"Different is good. So, don’t fit in. Don’t sit still. Don’t ever try to do less than you are," the Oscar winner said. "When somebody tells you you’re different, smile and hold your head up high and be proud. And as your villain, I would also say — cause a little trouble. It’s good for you."

In case you missed it, check out Angelina's full speech below!

On Saturday Kim and Kourtney Kardashian got together to take their kids to the movies, and the reality starlets definitely had their hands full! And we love Nori and Penelope, but how cute is Mason in this shot?! It certainly seems like he's inherited some of his dad's mischievous side...

Kim kept her brunette locks up in a tight bun, and though she appears to be wearing a full face of makeup, she went for a more casual look with jeans and a tank top. The curvaceous reality starlet outfitted Nori in a cute black skirt and top combo, and as usual the 19-month-old wasn't in the mood to smile for the cameras. Hey, she gets it from her daddy!

While Kourtney posted a few throwback pics on Instagram this week of the day she met Scott, we haven't seen the couple together since he returned from rehab last week. Scott was spotted at the Montage in Beverly Hills on Friday, and later in the day Justin Bieber posted a photo with Scott's son Mason, but it doesn't appear as though Kourt got an invite to that party. Hmm...what's going on with these two?!

We're not sure, but at least she has the support of her sister Kim!

Can you believe she's 51?! We seriously can't...

Real Housewives of Beverly Hills star Lisa Rinna headed to Zoetry Paraiso de la Bonita in Mexico with husband Harry Hamlin and their kids for spring break, and we were blown away by how good she looked in a one-piece swimsuit!

Lisa struck a pose while cruising around on one of the resort's catamarans, and if you're wondering why Lisa and Harry look so lovey dovey, it's because they're celebrating their 18th anniversary! The duo dined at La Canoa on the eve of their big night, and during the day the family soaked up the sun at the pool and spent time at the spa.

Rinna posted a photo on Instagram and wrote, "My girls can't get enough of! We were ALL in need of a #MexicoEscape." Um, we're jealous!

Keepin' it classy!

On Friday evening George and Amal Clooney went out to dinner in New York City, but rather than getting all glammed up for a night at a fancy restaurant, the couple went to the home of journalists Tina Brown and Sir Harold Evans for a night in.

Clooney carried a copy of Evans' 1998 book, The American Century, and even though they weren't in black tie garb, they looked like they could have easily graced a red carpet.

The couple, who tied the knot in September, have been in NYC for the last few months, after Amal nabbed a professor gig at Columbia Law School. George is currently shooting Money Monster at Kaufman Studios in Long Island, so that worked out well!

First there were rumors that Calvin Harris and Taylor Swift were dating, which we were into. He's hot and talented, she's hot and talented and let's be honest -- we'd love to see what they could come up with musically! But just two weeks ago the hunky Scottish DJ told the Capital FM Breakfast show Taylor is "the opposite of my type" and proclaimed that he'd swipe left (i.e., reject her) if he ever stumbled across her on Tinder!

In his defense, he could have been trying to keep their romance on the DL at the time, because after the news hit the internet last week, the duo were all over each other at Kenny Chesney's Nashville concert on Thursday.

But is it all for love or is this a possible business move too? While Calvin isn't exactly hurting in the cash department (he's worth an estimated $70 million), a source tells TMZ that "Calvin is the best businessman among DJs and knows the cache of dating the biggest pop star in the world." Calvin has apparently "developed feelings" for Taylor, but the source adds that Calvin is "wired for success and there's no hard dividing line separating his personal life from business."

Better watch your back, T. Swizzle!

Talk about an unlikely duo!

After sweating it out at the dance studio earlier in the day, Justin Bieber stopped by the Montage in Beverly Hills to soak up the sun at the pool on Friday afternoon. At first we thought it was a coincidence that we caught Scott Disick leaving the hotel a few hours later, but after the Biebs posted a photo on Instagram of himself playing with Scott's son Mason, it was clearly a planned get together!

Justin is super close with Kendall and Kylie Jenner and he's hung out with Scott before, but seeing as the reality star is fresh from rehab, is hanging out with a smokin' hot 21-year-old party-loving playboy the best idea? Probably not, but Bieber does seem to be having a blast baby sitting, so that has to count for something!

And speaking of shirtless poolside snaps, Bieber's pretty female friend seemed all too happy to pose for the photo below: