Bono can buy a lot of sunglasses with $1.5 billion. (Michael N. Todaro/FilmMagic)Bono must "like" this. The U2 frontman became the richest rock star in the world on Friday, the same day Facebook went public — all because he has a 2.3% stake in the social network. Back in 2009, Bono's company, Elevation Partners, invested $90 million into the site, and now three years later, he has made more than 16 times that amount for an astounding $1.5 billion. Not bad, right?

Houston and Brown in happier times. (Jeff Kravitz/FilmMagic)Bobby Brown is grieving the loss of his ex-wife, Whitney Houston, the best way he knows how: through song. During an appearance on "The Tonight Show With Jay Leno" on Wednesday, the R&B singer debuted a new track he wrote about the late superstar, strangely titled "Don't Let Me Die." As drums start out the song, Brown sings, "Been about a month since you've been gone/I guess it's pretty clear that you ain't coming home." He then goes on to croon, "I didn't realize that every breath I took was for you/You were my air" — which is particularly odd since he and Houston have not been a couple since 2006 and he is currently engaged to the mother of his youngest son. Conveniently, Brown will include "Don't Let Me Die" on his upcoming solo album.

Minaj. (Danny Martindale/Getty Images)Brown. (Matt Jelonek/Getty Images)Nicki Minaj shows a kinder, gentler side in the new music video for her song "Right by My Side" — well, at least in the first half of it. In the beginning of the clip, the R&B singer/rapper sits alone brooding over what appears to be a breakup, before it then starts to go backwards to highlight the ups and downs of the romance between she and her onscreen love interest played by Nas. As she sings, "I'm not living life if you're not by my side," we see the rapper shower Minaj with a brand new car and shopping sprees in Beverly Hills. That's when Chris Brown pops up to sing from the male's perspective, although it's unclear if he's also the third piece in a love triangle.

Joey Fatone talks to omg!. (Ethan Miller/Getty Images for AEG Live)It's been eight years since boy band *NSYNC last belted out a tune together, but former member Joey Fatone knows better than to officially rule out a future reunion at some point.

"You never know," he tells omg!. "Everybody has their own stuff right now. Everybody's in their 30s and I think the time is not right yet, but you never know. There might be a time where it's just like, 'Hey, let's get together and have some fun.' I think that's what it boils down to is really getting the five of us together and saying, 'Do we do it or not?'" he explains. "You saw New Kids [on the Block] do it. Years earlier if you asked, 'Hey you want to do this?' They'd be like, 'Heck no. I ain't doing that! Never.' And then look where they are now."

Usher's mom was so upset about his wedding, she skipped it. (Rick Diamond/WireImage)The custody battle between Usher and his ex-wife Tameka Foster has gotten worse — if that was even possible. After arguing in court over everything from money to drug abuse, the two are now fighting over the R&B superstar's Georgia mansion: she lives in it with their two sons, and he wants it back. Under their divorce settlement, Usher, 33, is entitled to sell the property whenever he likes, as long as he gives Foster 60 days notice. According to a source who spoke to TMZ, the 41-year-old fears that her famous ex will sell it immediately just to spite her and leave her and their two sons homeless, so she wants him to buy her another — which he is refusing to do.

Cruise rocks out for W. (Mario Sorrenti/W)For those who were left salivating after seeing Tom Cruise shirtless and tattooed on the June cover of W last week, there's more! The magazine has released three new photos, which show the actor — sporting long hair and fake ink — putting on his best rock star poses to promote his upcoming movie musical, "Rock of Ages." In the film, which is based on the mega-hit Broadway play, he plays Stacee Jaxx, a sleazy '80s-era rock star that's part Axel Rose, part Bret Michaels — but with Cruise's own special spin. After learning how to play guitar and training with the Guns N' Roses singer's vocal coach for weeks, "I was thinking about the character, and I said, 'You know what? I need a monkey,'" Cruise, 49, tells the magazine in its June issue. "Adam [Shankman, the film's director] said, "What the f--k are you talking about?' And I said, 'I'm serious — I need a monkey.' When Stacee's not onstage, he's kind of sad. And I thought this guy has to have a monkey that's his best friend."

(Doug Meszler/Splash News)Adam Lambert's new album is called Trespassing, but he was certainly a welcome guest this morning on "Good Morning America." The entertainer, sporting a hair-raising 'do for his appearance, sang his new single, "Never Close Our Eyes," on the morning show in anticipation of the album going on sale Tuesday.

Brown. (Doug Meszler / Splash News)Rihanna. (Jackson Lee / Splash News)Rihanna and Chris Brown really have one volatile relationship. The exes, who reconciled very publicly in February, are apparently back on the outs because of a verse he wrote and sings on a remix he did of Kanye West's "Way Too Cold," which Rihanna thinks is aimed at her — so she unfollowed Brown on Twitter. In the song, the R&B star blasts, "Don't f--k with my old bitch/It's like a bad fur/Every industry n---a done had her/Shook the tree like a pumpkin just to smash her/Bitch is breaking codes, but I'm the password." Although Brown doesn't call Rihanna by name, she is the only famous ex he's had, so no wonder she's upset.