Christina Hendricks is a screen siren on British GQ's September cover. Photo courtesty of British GQ

British GQ is seeing red this September.

Flame-haired "Mad Men" beauty Christina Hendricks smolders in a curve-hugging red dress on the cover of the magazine's September issue while armed with a pair of gardening shears.

And something tells us the fellas won't be paying attention to her green thumb.

Inside, Hendricks -- who has been praised by a British politician for having the ideal body -- flaunts her voluptuous figure in a pinup-style navy robe and bustier.

Damn -- maybe we should give up diet and exercise too.

"I adore the incredibly tight clothing," Hendricks tells the magazine in her interview.

"My own wardobe's changed -- I've streamlined a little bit and definitely learnt from Joan's sleekiness and tailoring."

The actress also weighs in on her character, Joan Harris.

"Joan's a dream to play -- she's not always prancing around the office," she says.

"There's that side to it, which is really fun, but there's nitty-gritty.

"She's what makes the workplace so fun -- in a workplace that can be so dark and so much tension, Joan gives some levity.

"And the wonderful thing is she still has these darker moments among the fabulous highs."

For more of the interview and to see photographer Miles Aldridge's other photos of the star, visit British GQ online, or pick up the September issue, on sale Aug. 5.

Meanwhile, go "behind the seams" for details on "Mad Men" holidays style.