Anytime a rock is on that finger, we have to wonder!

Demi Lovato made her way through LAX last night, and the diamond sparkler on her left ring finger was hard to miss!

Although her rep has denied she's set to tie the knot, rumors of an engagement to boyfriend Wilmer Valderamma started swirling after the "Skyscraper" singer tweeted a picture of herself wearing it with the caption, "Sooooo I don't think I've ever been happier in my life than this very moment that I am fully living in..."

The former X-Factor judge didn't help calm the whispers, either, when she posted a message gushing about her actor beau, who turned 34-years-old yesterday.

"To the funniest, most inspiring, incredible man I know.. @WValderrama - thank you for helping me get through my darkest moments.. You truly are a light to this world and to my life.. Happy Birthday!!!"

She could just want to keep the happy news private for a while?

Justin Bieber's dad Jeremy Tweeted this adorable pic of his two sons fast asleep in bed, at the family's Toronto home on Thursday.

But all is not well in Bieberland ... the pop star turned himself in to Toronto police Wednesday night on an arrest warrant stemming his alleged assault of a limo driving back in December. That charge, coupled with Biebs' recent DUI arrest in Miami, has Justin's attorneys working overtime and JB's dad taking to Twitter to defend his son.

The 39-year-old father-of-two captioned the pic, "Safe and sound #homesweethome." And Tweeted: "'Lovin on @JaxonBieber and @JazmynBieber. FAMILY."

Meanwhile, Justin had some words of his own, praising his dad's parenting skills, writing: "I have the greatest Dad in the world,. He's taught me how to love, learn, and stay true to myself. I will forever be grateful because he was my superehero #batman," along with a photo of his pop wearing a Batman beanie.

It's just a big lovefest up there north of the border! Still, we can't help but think there's a bit more trouble on the horizon as the pop star deals with all his legal troubles ...

The sexiest Latina and the hottest Bajan beauty get up close and personal in their new music video for "Can't Remember To Forget You." Shakira and Rihanna have joined forces for what's gotta be steamiest video since Miley stripped down for "Wrecking Ball." Check it out!

Miley Cyrus was PUMPED for her visit to Jay Leno on Thursday - her hair was done up, pompadour-style ... in fact, Miley looked a little LIKE Jay Leno yesterday when she visited the late show host.

Was Miley paying tribute to the soon-to-retire late show legend or was she merely styling her awkward-phase crop in the best way her hairstylist could? Uh, YOU decide ... Miley Tweeted this last night:

Jessica Simpson isn't flaunting her famous curves in the new ad campaign for her Jessica Simpson 2014 Collection -- the 33-year-old new, second-time mom is showing of a more svelte look in these sexy bathing suit pix.

Yes, she's still got her famous D-cups but the curvy hips and bodacious bod she used to have seems absent in these new modeling shots for her Spring-Summer collection.

An old Hollywood glam, white bathing suit seems to mask her usual hourglass figure ... and to what does she attribute this dramatic weight loss? To Weight Watchers, of course! A WW spokesperson, Simpson says the weight-loss program helped her lose weight after the births of her two children - Maxwell Drew, 20 months; and Ace Knute, seven months.

Still, we know the second-time mom has been successful in dropping the pounds, but do you think there's any Photoshopping going on here? Or maybe a corset, perhaps?

Apparently Red Bull doesn't just give 30K millionaires on the Sunset Strip wings -- it also gives a 55-year-old pop icon energy for a workout. Less than 24 hours after Madge teamed up with Miley Cyrus for the 21-year-old twerker's MTV Unplugged special at the Sunset Gower Studios, Madonna kept her fit form in shape with a trip to Cycle House in West Hollywood on Thursday. I guess we know how the Madge gets her boundless energy -- Red Bull's Red Edition!

For the workout, Madonna was dressed in sweat pants, sweatshirt and a rather interestingly worded beanie. It's possible the Material Girl is sending a message to her fans with her "Commes Des F*ckdown" hat.

On. Jan. 17, the 55-year-old lit the Internet aflame when she posted a photo of her eldest son at the boxing gym and wrote, "No one messes with Dirty Soap! Mama said knock you out!" along with the hashtag "#disni**a." A few minutes later Madonna uploaded the same picture, and though she removed the N-word, she kept the language just as foul. "Ok let me start this again," she wrote. "#get off of my d*ck haters!"

Subsequently, there was public outcry and the Grammy winner apologized for using the derogatory term.

Madonna said in a statement:

"I am sorry if I offended anyone with my use of the N-word on Instagram. It was not meant as a racial slur. I am not a racist. There's no way to defend the use of the word. It was all about intention. It was used as a term of endearment toward my son who is white. I appreciate that it's a provocative word and I apologize if it gave people the wrong impression. Forgive me."

With a hat like that -- it doesn't look like Madonna is apologizing for her wild side any time soon!

She doesn't seem that broken up about the end of her marriage!

Hilary Duff grabbed an early lunch at Cecconi's in West Hollywood today, and the singer flashed a huge grin on her way into the eatery!

The former Lizzie Maguire star and husband Mike Comrie announced they were splitting in January, and a new report claims that the 26-year-old came to the difficult decision with the help of a clairvoyant!

"Her psychic actually told her to leave her husband. In fact, she told her to never marry him years ago! She almost called off the wedding," a source dished to In Touch.

"When the psychic told Hilary that she and Mike weren't meant to be together, it was a breaking point," the source added.

She does look happier than she's been in years!

Not!

Sean Penn arrived at the studio in Santa Monica today, and well... he looks like he woke up on the wrong side of the bed this morning.

Enough said.