Summer is really starting to heat up, as evidenced by co-stars Amber Heard and Matt Bomer, who both sizzled at their film’s premiere. But it looks as though Demi Lovato took “Magic Mike XXL” a bit too seriously, stripping down to a bikini top and stilettos for her own rooftop bash.

Amber Heard

Heard may work behind the camera as photographer Zoe in the season’s hottest flick, “Magic Mike XXL,” but all eyes were on the newlywed starlet as she walked the red carpet in a scarlet Emilio Pucci gown at the film’s European premiere at the Vue West End in London.

Matt Bomer

Talk about a three-alarm fire! “Magic Mike XXL” stripper Bomer looks as good suited up as he does stripped down in a gray Giorgio Armani three-piece suit at the film’s European premiere.

Sandra Bullock

Who says fashion can’t be fun? Bullock, recently named People’s Most Beautiful woman of 2015, accessorizes a black Roksanda Pre-Fall 2015 dress with custom yellow Minion-fied Rupert Sanderson pumps at the LA premiere of “Minions” at the Shrine Auditorium.

Ciara

It takes serious strength to wear this weighty Wes Gordon frock, embroidered with Swarovski crystals, at the BET Awards in LA.

Demi Lovato

We may be crushing on Lovato’s badass bikini top, but pairing the suggestive look with denim cutoffs and thigh-high stiletto boots leaves her looking trashy for her “Cool for the Summer” pool party at the Gansevoort Park Avenue in NYC.

Judy Greer

Designer Bibhu Mohapatra seemingly found a boring purple dress on the discount rack at Macy’s, slapped some black fabric up top and convinced poor Greer to wear it for the “Ant-Man” premiere at Hollywood’s Dolby Theatre.

Nicki Minaj

Minaj’s black Givenchy gown could double as funeral attire at the BET Awards.

Lydia Hearst

The red-headed socialite can’t buy her way onto a best-dressed list with this schizophrenic frock at the premiere of “Ant-Man.”

Clarke’s Rosie Assoulin graphic dress may cause some optical illusions, but there’s no mistaking this halter dress with unnecessary cutouts as a fashion fail at the LA premiere of “Terminator: Genisys.” Days later, she redeemed herself in a feminine, leg-baring Isa Arfen frock at the film’s Seoul premiere.