Katy Perry and her gorgeous dark mane are the perfect pair to promote ghd hair products. Russell Brand's wifey looks beyond gorgeous in the company's latest campaign.

In one of the photos, Katy lounges on a chair Cleopatra-style ... next to the caption, "Sleeping beauty woke up in the boho seventies, when parties were wild but hair was relaxed."

Loves it! Aside from strutting her sexy stuff in these ads, Katy opened up to OK! Magazine about Russell's addiction to flirting. She says:

    "He's my perfect match... but I do have to scold him when he flirts with my mother!"

Ouch! Find out what else she had to say about Russell's addictions ... after the jump.