Take one 15-year-old girl with a fondness for candid photos, add in an 18-year-old guy with a Mustang convertible, and what do you get, besides every parent's worst nightmare? A night in the life of Miley Cyrus. On Tuesday evening, the Disney powerhouse, who recently admitted to crying for "a month straight" over her breakup with teen idol Nick Jonas, was photographed with her "Hannah Montana" co-star Cody Linley as they reportedly left his Los Angeles pad. Cyrus then slipped into the passenger seat of his sports car and off they went. But before Billy Ray lets his fists do the talking, he might want to hear Cody out. "Miley and I are just friends," he insists to J-14 magazine (you've probably never heard of it unless you think Zac Efron's long lashes are the height of dreaminess). "She's my buddy. People hang out with each other. They go out to eat, they go camping, they go hiking, they go get ice cream. People do have friends of the opposite sex. She's one of my really great buddies." As for their together-time on Tuesday, Linley pooh-poohs, "We were just hanging out. ... We were painting." (We're gonna assume that last part isn't teen-speak for "come up and see my etchings.") In other Miley news, has she already found the perfect "bad" ride to mark her upcoming 16th birthday? So claims In Touch, which says she's picked out a convertible Mercedes with a price tag in the ritzy neighborhood of $75,000. "Miley wanted special options like parking assist and a cream-colored leather interior, so she ordered the car early," a "pal" tattles to the magazine. "She's telling everyone that she hopes to get a car when she turns 16, so when it comes, she can say it was a surprise from her parents." Cyrus recently told Radio Disney that she wanted a vehicle "big enough for all my friends and to scare all the cars away from me. I'm a good driver, but it's everyone else that I'm worried about!"

Cameron and Paul watch the U.S. Open in New York.

Cameron Diaz and boyfriend Paul Sculfor appeared to keep a closer eye on each other's lips than on the bouncing ball as they got their cuddle-bunnies on during Andy Roddick's winning match at the U.S. Open on Tuesday. (We'll spare you any punny tennis references of the love, score, or mixed doubles variety. You're welcome.) But the pair, who began dating about three months ago, was less hands-on during a shopping trip earlier in the day. The New York Post says the strapping model-cum-Jennifer Aniston fling was striking a bored pose as the lately ring-flashing actress checked out the designer wares at a Manhattan boutique. "Paul stood near the front of the store, looking out the window," says a spy, who adds that when a "giggly and happy" Cam emerged in a Stella McCartney frock, Sculfor "admired the dress, [but] he wouldn't go near the dressing room."

Jamie Lynn introduces Maddie to Wal-Mart.

In between supposedly sending a thrifty baby gift to a pregnant teen she doesn't know (already denied), Jamie Lynn Spears is rumored to be keeping Casey Aldridge, her fiancé and father of her 2-month-old daughter Maddie, on a tight leash. In its "Fight for Baby Maddie" cover story, Star claims that the starlet, 17, miffed over reports that Aldridge's eye has wandered (repeatedly), has given him a curfew, suggested couples counseling and insisted he hand over his e-mail and voicemail passwords. The tabloid also floats the possibility of a battle over custody and cash. "He's not a spiteful person," alleges a "friend" of Casey's. "He plays to win. He doesn't really want full custody of Maddie, but he knows it might be his best weapon against Jamie Lynn." The source believes the 19-year-old pipe-layer (it's OK to snicker) just wants to maintain the lifestyle to which he's become so easily accustomed. "She was giving him tens of thousands of dollars for electronics, video games and the truck that she bought him," says the snitch. "In fact, he spent $8,000 last month alone on gas and sporting equipment."

Hugh Grant isn't going to let a little thing like a two-decade age difference get in the way of his wooing. Us Weekly reports that the actor, who turns 48 next week, hit an Aug. 31 shindig in the Hamptons with one Catherine Fulmer, a 27-year-old fashion designer. The pair was "touchy-feely and flirty," a spy tells the mag. "They were getting lots of attention." Too much, perhaps. Grant's rep downplays the dating rumblings to the London Sun, saying, "They just met at a party."

Jessica Simpson doesn't exactly play things close to the chest, as her recent overshares onstage and with the press prove. So color us skeptical over this little tidbit from Star, which claims the countrified singer has been secretly referring to her Dallas Cowboys beau, Tony Romo, as her FBD, or, to use the technical term, "future baby's daddy." Jess, who had paparazzi focusing intently on her midsection when she stepped out this week in a voluminous maxi-dress, supposedly uses the acronym only when talking with pals, not around her quarterback squeeze. "She knows he's not ready to get that serious, so she's playing it cool. Tony doesn't know, of course," says a "friend," who may need a refresher on the whole "playing it cool" thing. "I would love to be making records and making babies and hopefully I'm married in 10 years," a typically candid Simpson gushed this week to Fox News. "I have the dreams of every normal person."

Sienna and Balthazar are spotted having lunch in Malibu. (©X17Agency.com)

Could there be something to reports that Sienna Miller and Balthazar Getty are looking for a deluxe love nest in Los Angeles? The starlet's stepmother says she now feels the need to flee London, where her house was reportedly defaced with the word "slut." "It's disgusting that she cannot live in her own country," fumes Kelly Hoppen to Metro UK. "Why is it that if a man leaves his wife, the new woman gets all the s---? That doesn't happen the other way 'round." Sienna, who spent last weekend in London with the still-married father of four (they were less than pleased with the paparazzi attention), also has a more surprising ally: Sadie Frost, the ex-wife of her former fiancé, Jude Law. "She is a nice person. She's young. She's a free spirit," Sadie, who's best known as Winona Ryder's vampire-succumbing BFF in "Dracula," tells the London Evening Standard of Miller. "She has been really unfairly treated. Whatever she does in her personal life, that is between her and the other person. It isn't for the media to persuade the public that she is a bad person."