Mariah Carey was spotted at the famous Dorchester Hotel in London, England Monday morning (Jun 25) donning a bright red tight-fitted trench coat. She matched the ensemble, which complimented her curvy waistline, with a pair of platform Louboutin platform heels, large shades and a black dress.

Meanwhile, the mother of twins has reportedly been in the lab working on new material with heavy hitters such as DJ Clue, Randy Jackson, Jermaine Dupri and Bryan-Michael-Cox.

While remaining coy with the details, the R&B diva has also been dropping heavy hints via her Twitter. Last week, she teased her fans about a mysterious “project,” which she apparently plans on releasing sometime this summer.

“So.. Summer 2012.. Been in the lab, mixing up some concoctions for you, hope you like it!! #MCSummer2012,” MC tweeted, along with an image that read “MC: Summer 2012.”

Nick Cannon confirmed back in January that his wife was working on her first album since 2009’s “Memoirs of an Imperfect Angel.” He said, “She’s rejuvenated and ready to start sharing some of the amazing new music she has been making in the studio.”

Adding more “mystery” to the mix, Mariah tweeted Sunday:

Are you looking forward to new music from Mariah Carey?