Tending to their Halloween party hosting duties, “Twilight” co-stars Ashley Greene and Kellan Lutz were in festive mode at Tao Nightclub at The Venetian in Las Vegas on Saturday night (October 31).

With Miss Greene decked out in a sexy peacock costume, Mr Lutz opted for a superhero ensemble as the pair drank and danced with clubgoers as Veuve Clicquot presented Yelloween.

As for Kellan and Ashley’s upcoming movie, “New Moon,” the Emmett Cullen stud recently chatted with MTV about his favorite “New Moon” scene.

He tells, “My favorite scene is probably anything that Charlie is in, played by Billy Burke. He just has this great comedic timing, and every scene [with him], I get a laugh out of. And there’s just tons of action. That’s the thing too, seeing the wolves actually fight each other and roughhouse. It’s really interesting to see what Chris did.”

As for his favorite new character, Lutz reveals, “The Volturi boys. I didn’t meet them in ‘New Moon,’ so now [I see them on the ‘Eclipse’ set]. I didn’t have the time to meet them when we were shooting ‘New Moon’ because the shooting schedules were different. So, with seeing them, and finally meeting them on ‘Eclipse,’ they’re really cool. It’s interesting to finally meet them. It’s so weird being an actor in something and not being a part of the whole cast feeling.”

Costuming up as a match made in heaven, Mariah Carey and Nick Cannon were in the holiday spirit at their annual Halloween bash in New York City on Saturday night (October 31).

Dressed as a pair of angels, the couple happily posed for pictures in the arrivals area before playing hosts at the M2 Ultra Lounge fete.

During the course of the evening, guests including Rihanna, Ne-Yo, Ice-T and Coco, and DJ Clue got the party in full gear as DJ Sexy Fingers provided the musical entertainment.

Meanwhile, Nick had quite the busy day - as he spent the morning alongside Amy Robach and Lester Holt at the Halloween Weekend Today Show at Rockefeller Center.

Kickstarting three weeks of promotional duties, Robert Pattinson made the long overseas flight to Japan - landing on at Narita International Airport in Chiba on Sunday (November 1).

Not getting much of a break after wrapping up the filming of “Eclipse” in Vancouver, the Edward Cullen actor seemed in high spirits as he began his worldwide whirlwind tour to promote “New Moon”.

Fresh off the 15-hour flight, the British hunk was reportedly met by hundreds of screaming “Twilight” fans who had waited hours to catch a glimpse of the star.

After heading to his hotel, Pattinson is slated to appear at a fan meeting in Tokyo.

Treating her young son to an evening of tick-or-treating fun, Christina Aguelira was spotted toting Max Liron around Los Angeles on Saturday (October 31).

Dressed up as matching pirates, the “Genie In A Bottle” babe and her boy went door-to-door while being driven down the street by the family patriarch, Jordan Bratman.

Meanwhile, Miss Aguilera recently spoke with Mail on Sunday, talking about the two important men in her life - Jordan and Max.

Of her hubby, Christina tells, “Jordan is pretty genius. Although I’m the more creative one, he understands the music business and really helps me with my brand. I gravitated towards music because it was a release out of a very chaotic environment when I was growing up. I didn’t realize till many years later that it was an escape, but obviously I had a passion for it and it grew into a career for me. I don’t have to do it at this point, but I do it because I love it.”

As for Max, Aguilera said, “I play him Led Zeppelin and the Rolling Stones,. And if Max wanted to have a music career for the same reason, then I would say, ‘Go for it.’ I am really into encouraging him as an individual – whether he wants to be a vet, a scientist or a garbage man. As long as he has a passion for it.”

Getting into the holiday spirit, Alyson Hannigan and her husband Alexis Denisof toook baby Satyana out for her first Halloween in Santa Monica on Saturday (October 31).

The happy family dressed in matching kangaroo outfits, strolling about the city streets in search of a bagful of sweet treats for their baby girl.

Making sure to give little Satyana a memorable first Halloween, Alyson and Alexis spent the previous day making a visit to Mr Bones pumpkin patch.

Dressing their daughter up as a pretty pink bunny, the “How I Met Your Mother” actress and her hubby definitely appear to have a liking for wildlife-inspired outfits.