Friends star Matthew Perry, 42 and Mean Girls actress Lizzy Caplan, 29 (who have been quietly seeing each other for quiet some time now) made a rare public appearance as they joined the slew of stars taking in tennis matches at the US Open in NYC on Thursday. The two looked like they were having a great time as they laughed and smiled during the entire game.

These two aren’t the only stars whose relationship have people scratching their heads.

From Alec Baldwin and his much younger yoga instructor girlfriend to Twilight star Nikki Reed and American Idol‘s Paul McDonald‘s whirlwind romance, there are plenty of surprise couples that make it work.

Although some have since broken up (like Christina Aguilera and her ex-hubby Jordan Bratman), we were able to put together this list of some of the most random celebrity couples.

Take a gander through the gallery and let us know on Twitter or Facebook — which do you think is the MOST random?

The Jonas Brothers hunk dished about his surprisingly un-Nick role in ABC’s Mr. Sunshine during a recent appearance on MTV’s The Seven (via MTV’s Buzzworthy blog).

“I was approached by [star] Matthew Perry and his team about doing this role and it seemed like a lot of fun to do something different from myself,” Nick told Seven host Kevin Manno about his decision to do the show. “I play a jerk on the show which is not my personality.”

On the new show, Nick plays Eli, a tweener pop star with a bad attitude and diva demands. The character is quite the departure for Nick who’s previous TV work consisted of playing a character loosely based on himself on Disney Channel’s JONAS (RIP).

However, just because Eli is a jerk doesn’t mean that there are some nods to Disney-style pop acts on Mr. Sunshine– when Matthew’s character refers to Eli as a “pop star” the young star scoffs and declares that he is a rock star. “You do have your own Saturday morning cartoon show though, right,” Matthew’s character asks.

Watch Nick’s interview (and a clip from Mr. Sunshine) below.

As for Nick’s real life diva demands, the sweet pop star reveals that he doesn’t have many requests but that he does enjoy drinking pineapple juice backstage. Hey, we’ve all heard of weirder demands, Nick!

Nick’s Mr. Sunshine episode airs on Wednesday at 9:30/8:30 C on ABC.

MTV’s The Seven airs Monday through Friday at 5/4 C.

Will you watch Nick’s episode of Mr. Sunshine? Share your thoughts in the comments.

Hopefully it isn’t a Friends curse, but only two of the six stars are currently married, while three are divorced (or possibly headed there) and another two are living the single life.

Click through to see which of the Friends found lasting love – and who’s still searching. Who do you most want to see in a happy relationship? Let us know in the comments.

This time around we have an actress whose controlling mother is driving her to cutting, a very nice A-list actress, and a popular actor who keeps making flops.

Mommie Deartest:

This all grown up actress might seem smart and confident, but sources reveal that she’s anything but. We hear that she has such a troubled relationship with her mother, she is secretly a cutter. Her mother is extremely controlling and demands to know all the goings-on in the star’s life. The actress calls her at least twice a day explaining her recent projects, her relationships and her day to day activities and problems. The actress secretly resents her mother but is so attached and afraid of her, she can’t help but keep up this sick cycle, even though she is an adult. Not Jessica Alba. (Buzz Foto)

Our guess: Katherine Heigl.

The Kindness of A-listers:

This A list movie and formerly television actress (and it pains me to call her A list), did something really nice on the set of her most recent flop (although it was supposed to do much, much better). On the set, she met a cameraman who spoke to our actress about the fact that his mother was dealing with a life threatening illness. She always took time to talk to him, listen to him and ask about his mother. She went way out of her way everyday to check up on him and the condition of his mother. After filming ended, the mother passed away. Our actress sent flowers and a very long letter to the cameraman consoling him for his loss. (Crazy Days and Nights)

Our guess: Katie Holmes.

Not-So-Sunny:

All actors have their ups and downs in their career. Some have them independently of a career. This actors’ previous series attempt have flopped quickly. Although he has recovered each time to land another gig, the failure is starting to take a personal toll on him. His sunny personality is gone, he’s gaining weight, and is spending every night in a bar, drinking away his rejection. Nothing funny about that. Friends are trying to distract him right now while his latest flop burns off episodes over the summer. (Blind Gossip)

Our guess: Matthew Perry.

Zac Efron looked like a real movie star in his slick, dark suit and side-swept hair. The heartthrob was met by hundreds of screaming fans, who showed up with hopes of catching a glimpse of the teen idol.

He told E.T, “It’s amazing. It’s a crazy feeling but I’m very excited. These are fans have been with me for a very long time so I’m glad they’re with me on this next step.”

Other stars on the red carpet included the rest of the cast, Matthew Perry, Michelle Trachtenberg, and Leslie Mann, along with Zac’s girlfriend, Vanessa Hudgens, and Disney stars Amanda Bynes, The Jonas Brothers, and Brittany Snow.

Take a look at our HUGE gallery from the premiere and let us know who you think looked the best in the comments section!

Zac Efron premiered his new film 17 Again in London last night, and it became a mob scene of screaming London schoolgirls looking to take his pic, touch his hair and view their High School Musical obsession in person.

Fans, some with hearts and “Zac” painted on their faces, began lining up at 7AM in Leicester Square in London just to get a glimpse of their idol, according to the Daily Mail.

In fact, the girls became so frenzied that one young woman was said to have collapsed and had to be taken from the crowd by paramedics to be checked over. The vapors!

In the movie, Zac plays a younger version of Matthew Perry after he is magically turned back into a teenager and has to counsel his children through high school.

Michelle Trachtenberg plays his teenage daughter.

Hopefully some of the advice he imparts to her in the film includes a warning against getting so worked up over a movie star that you need an ambulance.

Encouraged by the financial success of the Sex and the City big-screen adaptation, the stars of the show—most notably Jennifer Aniston—are finally ready to reprise their roles from the long-running sitcom.

In a scenario that sounded all too familiar to the SATC ladies, everyone had been hoping since 2004 for a movie to happen, except for Aniston.

However, the climate has changed, according to the source. “As the biggest star of the Friends franchise, Jennifer can’t help but look at what’s happened with Sarah Jessica Parker and the Sex and the City film and be a little jealous.”

This just got interesting…