Mariah Carey squeezed into a sexy red dress and performed at the 81st annual Rockefeller Center Christmas tree lighting ceremony in New York on Tuesday evening, and we're not sure which songs she sang, but we'll find out when the special airs tomorrow on NBC! (Though we're pretty sure Mimi belted out "All I Want For Christmas Is You," which is one of our favs from her holiday albums).

Mariah then changed into the white number below and wrote on her Instagram, "I know it's a lil' over the top lol #rockefellercenter #Christmastreelight." Isn't it always?!



Mariah performed at the event in 2010 and 2012, and this year other performers include Kelly Clarkson, the Goo Goo Dolls, Jewel, Mary J. Blige, Toni Braxton and Ariana Grande. Whew! That's quite a mix...

She's got legs for days! And those monster platforms are definitely giving her a boost too...

On Tuesday afternoon Beyonce Knowles and husband Jay Z lunched at Real Food Daily in West Hollywood, and the supercouple managed to fly relatively under the radar when they left the trendy vegan eatery.

While this isn't what most folks would wear to lunch, most folks don't look this good in leather shorts and 6-inch heels. Bey has a big show at the Staples Center in Los Angeles tonight, so we know Blue Ivy's mama will be showing even more skin when she takes the stage later this evening ... can't wait!

At least one Kardashian earned a degree!

Kourtney Kardashian and Scott Disick landed at LAX today after a whirlwind trip to Arizona, and it seems the Keeping Up with the Kardashians star was visiting her old stomping grounds for a little college reunion!

The mother-of-two attended University of Arizona back in the day, and based on her recent Instagram pics, it seems the E! darling headed to Tuscon to hang with some old pals.

"Fun night walking around my old stomping grounds with my Wildcat babes and LD #uofa," she captioned the below snapshot.

Meanwhile, her sister Kimmy K is busy globetrotting with her super famous rapper fiance Kanye West. Do you think Kourt ever gets jealous?! Or is she happy to be the most down-to-earth one of the family?

It was a Tropic Thunder mini-reunion!

On Tuesday Ben Stiller was honored outside the TCL Chinese Theater in Hollywood, and his former co-star Tom Cruise was on hand at the event. Ben's wife Christine Taylor and their two kids were also in attendance, and the actor celebrated his 48th birthday on Saturday, so we imagine the timing wasn't a total coincidence.

Ben is also promoting his upcoming film, The Secret Life of Walter Mitty, which hits theaters on Christmas Day. According to a plot synopsis on IMDb, the movie follows a man who "escapes his anonymous life by disappearing into a world of fantasies filled with heroism, romance and action. When his job along with that of his co-worker are threatened, he takes action in the real world embarking on a global journey that turns into an adventure more extraordinary than anything he could have ever imagined." Not exactly Zoolander, but judging from the trailer, it's going to be an amazing holiday flick!

The actor's hands and feet were imprinted in the sidewalk and placed in the Forecourt of the Stars, which is apparently the most prestigious spot at the theater. Congrats!

The pieces are starting to come together!

Paul Walker's death was not caused by drag racing against another vehicle, officials confirm.

"[Investigators] have received eyewitness statements that the car involved was traveling alone at a high rate of speed. No eyewitness has contacted the [department] to say there was a second vehicle," the Los Angeles County Sheriff's Department said in a statement Monday.

The Porsche Carrera GT in which the actor was traveling was reportedly going approximately 40 to 45 mph when it came to a dangerous bend in the road, NBC News reports.

Autopsies on the victims are said to be complete Tuesday pending positive ID's on both bodies, TMZ reports.

His family and friends are in our thoughts during this difficult time.

On Tuesday morning Anne Hathaway grabbed coffee and a bite to eat with a pal, and after that the Oscar winner picked up her dry cleaning in Beverly Hills. Such an exciting life she leads!

Anne wore a pair of jeans and purple loafers, and the dress she picked up was the one she wore to her birthday dinner last week with husband Adam Shulman and her Batman director Christopher Nolan.

Speaking of dresses, we wonder what Anne is going to be wearing at the Golden Globes and the Oscars this season? We have a feeling she'll be presenting at at least one of the major awards shows this year .... She always wows on the red carpet, so we can't wait to see!

Reese Witherspoon can feel the burn and is loving it! The Oscar winner was all smiles after her workout at Burn 60 on Tuesday morning in Brentwood, Calif. Looks like those endorphins have definitely kicked in!

We gotta hand it to Reese -- she really seems to be dedicated to working out! The actress has a couple projects in the works, so it's not surprising she's trying to stay in tip top shape for the big screen! The 37-year-old is currently filming Wild, a film based on Cheryl Strayed's 2012 memoir about her 1,100-mile solo hike. She's also set to begin shooting The Intern alongside Robert De Niro.

The mom of three has been hitting Burn 60 in Brentwood on the reg for the past few months. We aren't sure if it's because she is exercising for a role in one of her upcoming films, or if she just got inspired after pics of her bum were splashed all over the Internet when photogs caught the Oscar winner accidentally flashing her backside in June. Maybe that's just what the star needed to kick her butt into gear!

The 37-year-old made headlines when she debuted her slimmer bod at the Devil's Knot premiere during the Toronto International Film Festival in September.

Devil's Knot, which hits theaters in 2014, is based on the true story of three teenagers who were falsely convicted of killing two 8-year-old boys in Tennessee. The trio, known as the West Memphis 3, were released two years ago after spending 18 years behind bars. Reese plays Pam Hobbs, the mother of victim Stevie Branch, and Colin Firth also stars in the movie as Ronald Lax, a private investigator who represented one of the accused teens.

This is an interesting/random casting decision!

Rita Ora confirmed on Twitter that she has been cast as Christian Grey's adopted sister Mia in Fifty Shades of Grey. "It's official!" she wrote. "I've been cast in @FiftyShades of Grey as Christian's sister Mia. #FiftyShades"

The British singer will be joining Jamie Dornan and Dakota Johnson in the big screen adaptation of the romantic novel written by E.L. James. Charlie Hunnam was previously set to star as the S&M loving millionaire Christian Grey, but he dropped out after realizing it was a bad career move due to scheduling conflicts and creative differences.