Vanessa Hudgens

Singer/actress Vanessa Hudgens is in high spirits, despite the end of her four-year relationship with teen idol Zac Efron.

While celebrating her 22nd birthday in Las Vegas Saturday, Hudgens told People.com she and Efron were "good" when asked how things were between the two of them.

"High School Musical" sweethearts Zac Efron and Vanessa Hudgens have called it quits, reports E! Online.

"It's nothing dramatic," a source said, "There's no third party involved." Another source added, "They were together for so long. It just ran its course."

Musicians, actors and athletes are taking a stand in the fight against cancer.

Check out this new PSA featuring Vanessa Hudgens, Dakota Fanning and other stars participating in this year's live telethon, "Stand Up to Cancer."

As screaming girls swooned over Zac Efron at the premiere of his new film, "Charlie St. Cloud," there was one girl they all envied: Efron's main boo, Vanessa Hudgens.

"I'm so proud, I'm over the moon," Hudgens gushed to "Extra" about her man. "I feel like I'm blushing right now."

"It means a lot, she's really been pretty inspirational for me," Efron gushed back. "Like tonight, um, I'm really nervous about the whole thing. She's keeping my nose down."

Watch all the "Charlie St. Cloud" premiere action!

• Zac Efron planned a Disney star-studded surprise party for girlfriend Vanessa Hudgens.
• Gimme more, Britney! The director's cut of Spears' "3" music video has leaked onto the web.
• The "punch" on "Jersey Shore" brought the cast together.
• He can run, but he can't hide! Robert Pattinson was spotted at the Los Angeles County Museum of Art with Emilie de Ravin on Tuesday.
• "The Brady Bunch's" Barry Williams claims his ex threatened to kill him.
• "True Blood's" Sookie Stackhouse has a new love interest who has appeared in "How I Met Your Mother" and "One Tree Hill."

Miley Cyrus has a "High School" crush.

Cyrus, 17, admitted that she "really, really liked" Zac Efron, 22, on Sirius XM's The Morning Mash Up! as reported by Us Weekly.

"I think Zac Efron is the hottest person in the world. I really, really like him," the Disney star gushed.

But Miley doesn't have her sights set on stealing Zac from his girlfriend, Vanessa Hudgens -- his loyalty to his "High School" sweetheart is what makes him so appealing.

"Zac could get any girl...and do whatever, and he is so loyal and a really good friend...He's just like super good looking," Miley dishes.

Cyrus also proves she doesn't kiss and tell -- when asked about rumors she dated her "The Last Song" co-star Liam Hemsworth, the actress said, "I can neither confirm nor deny."