Zac Efron at the LACMA Art + Film Gala

Miley Cyrus & Zac Efron's Halloween with the Michalkas

Mingling with their closest friends while celebrating the Halloween holiday, Aly and AJ Michalka treated fans to some party insider pics from the weekend festivities.

The "78violet" singers took to Twitter to share the fun-filled photos, as the ladies posed in one shot alongside fellow former Disney star Miley Cyrus - who was looking ever so ghoulish for the west coast costume party.

Also roaming the grounds before being grabbed up for a Michalka sandwich shot was "High School Musical" hunk Zac Efron, who donned a Reno 911 police outfit.

Tweeting “Love our friends xo" with the photos, Aly and AJ rounded out their Halloween star shot pic releases with a too cute pic of themselves alongside the lovely Emma Roberts, who opted to dress up as a Playboy Bunny for her Halloween doings.

Zac Efron Sighting in Paris!

Zac Efron was spotted out and about just last night in the city of lights! The newly 24-year-old actor has been busy working for the last several months, but we’re glad to report that the single guy is back in action and hotter than ever! Photographers snapped the star a few days ago out and about in London, and now thanks to new pics of the actor heading out to Baron Nightclub in Paris, we’re starting to think he might be on a bit of a European tour. Perhaps that’s why he’s rocking a new mustache – tres chic!

Zac had a ton to celebrate aside from his birthday last week. We’ve just learned that he’s set to star in an upcoming comedy alongside funnyman Seth Rogan, who told MTV that he handpicked Zac to be his co-star. According to Seth Rogan, Zac “seemed like he was a really cool guy, that he’d be fun to work with and seemed that he was capable of much more than the Disney stuff we’ve seen him in.”

Of course we totally agree – but what do you guys, the fans, have to say about this?

Zac Efron's Box Birthday Bash

This past Tuesday he celebrated his 24th birthday, and last night (October 20) Zac Efron was spotted living it up in London, England.

The “Charlie St. Cloud” hunk was joined by some friends as he hit up The Box nightclub where he stayed into the wee hours of the morning.

In career news, Mr. Efron has signed on to star in a new yet-untitled comedy opposite newly-married Seth Rogen.

Of the gig, Seth told press, “He was really looking to be sullied, which is why we thought it would be a good idea. He seemed like he was a really cool guy, that he’d be fun to work with and seemed that he was capable of much more than the Disney stuff we’ve seen him in.

Zac Efron with Fans Heartland on Set

Zac Efron Gets Bloody in Boxers for "The Paperboy"

Working well into the nighttime hours on his new movie, Zac Efron was quite the sight to be seen on the set of "The Paperboy" in New Orleans on Friday (August 26).

The "High School Musical" alum roamed the Big Easy filming grounds in a white tank top/boxers combo - all the while covered in blood as he was joined by his lovely co-star Nicole Kidman.

The revamp of the 1995 novel offers up a slew of other Tinseltown A-listers including Matthew McConaughey and John Cusack, as well as "The Help" actor David Oyelowo.

The film, due out in 2012, centers around "a reporter who returns to his Florida hometown to investigate a case involving a death row inmate. "

Zac Efron & Nicole Kidman: "The Paperboy" Pair

Getting back to work on their star-laden movie, Zac Efron and Nicole Kidman both turned up on the set of "The Paperboy" in New Orleans on Tuesday (August 23).

The "High School Musical" alum and his "Australia" actress co-star both dressed in costume as they each took turns working their magic for the cameras.

Boasting a stellar cast, the film also stars Matthew McConaughey, Sofia Vergara and Tobey Maguire and is based on the 1995 Pete Dexter novel of the same name.

According to Publisher’s Weekly, the plot revolves around Narrator Jack James who is the son of the Moat County Tribune's editor and publisher. While Jack's older brother, Ward, reports for the Miami Times, Jack has settled for a job delivering papers for the Tribune. But when Ward and his partner, evil dandy Yardley Acheman, come to Moat County to investigate the four-year-old murder of the local sheriff, Jack assists them in the inquiry.