Royal Highness Rihanna is in the building! The Unapologetic creator celebrated Halloween Wednesday night (Oct. 31) by rocking a glittering tiara while being crowned queen of West Hollywood during the city's annual Halloween Carnaval.

She posed for photos on the red carpet for the event wearing a black lace dress and ditched her short 'do for some longer tresses. With her mother Monica in attendance, she also accepted the key to the city, which was presented to her by the West Hollywood mayor.

"Thank you guys so much," the 24-year-old pop star exclaimed. "I feel really special. I do feel like a queen right now. I'm not even from this city, so it's a big deal to be honored in the city and by the gay and lesbian community. I will make you guys very proud."

Queen RiRi has a busy month ahead of her. The songstress will embark on her 777 tour -- she's performing seven shows in seven countries in seven days -- beginning Nov. 14, release her seventh studio album, Unapologetic, Nov. 19 and appear as the musical guest on "SNL" Nov. 10.

Watch Rihanna Crowned as Queen of West Hollywood

See Photos of Rihanna's Harper's Bazaar Cover