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Rumer Willis celebrated her 21st birthday Saturday at Tao in Las Vegas, reports Perez Hilton.

The eldest daughter of Bruce Willis and Demi Moore is currently filming episodes for a guest appearance on teen drama 90210. She can also be seen in the upcoming teen flick Sorority Row.

Perez Hilton reports Rumer Willis, the eldest of Bruce Willis and Demi Moore’s three daughters, will be appearing on the CW’s 90210 next season as Gia, a punky lesbian who works on the school newspaper.

Willis, 20, is only planned to guest-star in one episode of the hit series, but may be called back to continue the role if it’s successful.

In the past, she has guest-starred on Army Wives, CSI: New York, and Medium. Each appearance was just for one episode.

According to Entertainment Weekly, she will also appear in an episode of ABC Family’s The Secret Life of the American Teenager, scheduled to air in mid-August.

Although reports claim that starlet Shenae Grimes is causing trouble on the set of 90210, Jessica Lowndes, who plays Adrianna, says otherwise.

According to E! News, Lowndes says the reports on ridiculous.

“None of it’s true. We’re all like a little family. There’s no drama, and everyone’s trying to create drama.”

As for drama on the show, Lowndes says audiences will expect a lot of it.

“Oh my God! It gets worse,” Lowndes said of her character. “The drugs just get harder and harder. And starting this Tuesday, my character starts her downfall. It’s pretty crazy. It’s pretty shocking. I definitely think people are going to be shocked.”

90210’s Shenae Grimes and Jessica Stroup are frighteningly thin.

Rumour has it the cast and crew of 90210 are worried Grimes and Stroup are losing too much weight.

“I heard some of the boys on the show are going to sit down with the girls and talk to them,” a source told US Weekly.

“They want the girls to gain weight. They are trying too hard to be skinny, and it’s started to wear on them.

“I’ve never seen Jessica or Shenae eat. It’s just not healthy.

“The girls were all skinny when they started, but they’re definitely thinner now.”

Penn Badgley of “Gossip Girl” has even weighed in on the situation: “I hope they eat a double cheeseburger or something.”

Grimes, who used to star in Degrassi: The Next Generation, is said to weigh about 90 lbs at 5′3″. Stroup, at 5′8″, is rumoured to weigh only 100 lbs.

Former “Degrassi: The Next Generation” star Shenae Grimes is reportedly becoming a monster on the set of the new 90210 show.

According to Perez Hilton, Grimes believes that she is the only star of the spinoff, snarling, “This is my show – everyone else is riding my coattails.”

When she’s not tormenting the regular cast and crew, she has even insulted an unnamed guest star, asking, “”Who the hell are you?”

While 90210 debuted to great ratings, viewers have dropped off very quickly.

For the CW network, a particular area code is good for business.

90210, the CW’s new modernized version of Beverly Hills, 90210, proved to be ratings gold for the network on Tuesday night.

The two-hour premiere averaged nearly 5 million viewers, according to Nielsen Media Research estimates. The CW said it was its highest-rated scripted show in its three-year history.

90210 was the night’s number 1 show among 18-to-34-year-olds. CW has been a struggling network since its birth in 2005 and hoped 90210 would be their knight in shining armour. Or in this case, it’s a grown up Brenda Walsh and Kelly Martin, both reprised by Beverly Hills, 90210 alum, Jennie Garth and Shannen Doherty.

Canadian actress and former Degrassi star, Shenae Grimes, is part of the new 90210 cast. The second episode airs Tuesday at 8 p.m. EST on CW.

Shannen Doherty says she feels a kinship with her new co-star, Shenae Grimes of “Degreassi: The Next Generation.” The new friends are currently filming the new 90210 series.

“Maybe it’s because her character is similar to how [my character] started out,” Doherty told USA Today. “It’s also because Shenae is smart and she knows what she’s doing, but at the same time there’s a vulnerability there, and I want to put my arms around her and protect her,” Doherty says.

With her past experience, Doherty is happy to be able to guide Grimes through new-found fame.

“The great thing is that she’s smart enough that she’s not going to make the same mistakes I made. But because I made those mistakes, I can help her along the way.”

The evil witch is back!

According to People magazine, Shannen Doherty will be reprising her role as Brenda Walsh on the CW spin-off 90210.

“Shannen is looking forward to returning to 90210,” Doherty’s rep tells the entertainment magazine.

Doherty, who played the twin sister to Jason Priestley’s character Brandon Walsh for four seasons of the original Beverly Hills, 90210, will return as a visiting drama teacher who directs a musical at West Beverly High School when the show premieres Sept. 2.

Other original cast members to reprise their roles are Jennie Garth and Tori Spelling. Spelling was to star in the pilot episode but backed out after giving birth to her daughter in June.

“I’m looking forward to returning to 90210 in a later episode,” Spelling told People earlier this month.

Nat’s back, while a teen vixen and a hunky lacrosse player spell fresh drama on the “Beverly Hills 90210″ remake.

Joe E. Tata, who played Peach Pit diner owner Nat on the original series from 1990 to 2000, recently finished shooting his scenes for the new CW show’s pilot episode.

He told AP the part was like “lightning striking twice,” though he didn’t yet know if he will stay on as a recurring character.

Tata joins other ‘90210′ alumni who have jumped aboard the remake. Jennie Garth will appear as Kelly Taylor, now a guidance counselor, in several episodes, while Tori Spelling will revive Donna Martin for at least one episode.

Shannen Doherty reportedly is in talks to reprise her role as Brenda Walsh, though the network has yet to confirm this.

Meanwhile, the famous zip code will also welcome two new residents in the form of Meghan Markle and Kellan Lutz.

Markle, who is best known as the model holding Suitcase No. 24 on the game show “Deal or No Deal,” will play Beverly Hills High vixen Wendy. The 26-year-old Markle will also appear in the upcoming ABC drama pilot “Good Behaviour.”

Lutz, 23, will play George Evans, a star lacrosse player who comes from a wealthy family. The actor can be seen in HBO’s upcoming miniseries “Generation Kill,” while his film credits include “Stick It,” “Accepted,” “Prom Night” and the upcoming “Twilight” movie.

Canadian Shenae Grimes will soon be getting a new postal code. Specifically, “90210.”

According to TV Guide’s Ausiello report, the “Degrassi: The Next Generation” star has just signed on for a role on the new “Beverly Hills, 90210″ spin-off.

The role was originally offered to Hilary Duff.

Ausiello describes Grimes’ character as “Annie Mills, a theater-loving teen who relocates to Beverly Hills from Kansas with her adoptive bro and their parents.”