Katy Perry is stunning in a glittery, sheer red dress as she gets festive in London and shows off her weight loss.

Katy Perry is stunning in her plunging corset dress as she goes braless for dinner in Paris with some very famous faces.

Katy Perry turned heads ... stunned in a sheer red sequin dress that highlighted her strikingly slim waistline. The bold and fiery ensemble featured a thigh-high slit and a transparent midriff ...

Katy Perry appeared holiday-spirited in a side-baring ... side cutouts. Her dress also had a unique string detailing that transformed into fringes and an epic thigh slit that made her appear ...

The backless dress ... Katy Perry walked the red carpet at the Jingle Bell Ball in a shimmering silver gown with a high slit up to her hip, a completely sheer skirt and daring cutouts on either ...

But one person who’s wasting no time is Katy ... side cut-outs spanning pretty much the entire length of Katy's torso and an additional key-hole cut-out at her stomach. However, it was at the ...

Pop sensation Katy Perry is preparing ... The beautiful dress featured a plunging neckline that showed off a lot of cleavage and two massive side cutouts. The rest of the dress was completely ...

Katy Perry attends iHeartRadio ... the festive theme in a silver sequin dress. The sleeveless gown included a high slit accented by fringed ties along the side. She carried the shimmering theme ...

Katy Perry has been, uh, kinda busy. After launching her seventh album, 143, last year — complete with some srsly iconic looks — she's embarked upon a major side ... but Katy's dress was ...

"Why is Katy Perry’s dress making me hungry," the user asked ... Speaking of treats, another Instagram account shared a side-by-side of Perry next to cotton candy. A miniature Perry was ...

Perry nailed ... entire left side and plunged all the way down her stomach to her right hip. Styled with a matching headpiece that wrapped around her hair and neck, the sparkly dress also ...