Miley Cyrus has started celebrating Halloween early and in one of the sexiest ways possible.

The 19-year-old shared her Halloween spirit when she tweeted a picture of herself on Tuesday, Oct. 16. In the photo, Cyrus is posing with her sister in front of a hanging, creepy fake ghost.

She stood in front of the holiday decoration with a surprised look on her face with the caption, "Boo!"

But there was only thing about the festive photo - she wasn't wearing pants!

While the image isn't raunchy, it is one of her sexiest to date.

On Wednesday Oct.17, she promoted her upcoming guest appearance on "Chelsea Lately" and "Two And A Half Men" from Twitter to her new Pheed account.

"Spread the word Team Miley! #MileyOnChelseaLately #MileyOnTwoAndAHalf Men...TUNE-IN to watch Miley on Chelsea Lately TONIGHT Wednesday, October 17th at 11:00 PM/10:00c on E!," she wrote on Pheed. "We have all been waiting for Miley's premier on "Two and a Half Men" TOMORROW Thursday, October 18th at 8:30/7:30 c on CBS= DON'T MISS IT!"

Pheed is a new social media platform that launched in August, according to Crunch Base. It is similar to Instagram but you can upload video as well as picture "pheeds" to your "pheeders."

Cyrus  shared a sneak peek of her guest appearance with her fans on Twitter. 

"Here's the 1st look at my appearance on @TwoHalfMen_CBS! Don't miss it Thurs Oct 18 8:30/7:30c on CBS!" Cyrus tweeted.

CLICK HERE to see a clip of Miley Cyrus' guest role in "Two and a Half Men."

The engaged singer appeared on "The Tonight Show with Jay Leno" on Oct. 12. where she talked about her next gig on the CBS hit "Two and a Half Men."

"I play someone who can't shut up, [and] I had to do a lot of character building," Cyrus joked. "I had to go deep on that."

Cyrus admitted to an on-air kiss with her co-star Jones, who plays Jake on the show.

The former Disney star will appear in a multiple episode story arch on the show as Jone's love interest, Missi, which means the two had to share a kiss. Apparently it made her feel a little strange.

"It was kind of weird because [while] I was doing it , here were the prop guys and they were like, 'Do you have your ring on?'" Cyrus told Leno. "And I was like, 'This feels weird' [to] take off my ring and make out with Angus.'"

She admitted that at first her feelings were mixed but things got better.

"I pictured [Jones] being a little 8-year-old," Cyrus continued. "But he was coming back from the military in the episode and he was ... putting on a suit, had a shaved head -- he looked good!"

Miley Cyrus will appear on "Two and a Half Men" on Thursday, Oct. 18 at 8:30 EST on CBS.

Tags: Miley Cyrus Liam Hemsworth two and a half men