Vogue and Vanity Fair are both picking beloved bad girls to grace their September issues. Sources say Anna Wintour‘s fashion bible has booked Mario Testino to shoot Kate Moss‘ July wedding as its cover story, while Italian Vanity Fair has shot under-house-arrest Lindsay Lohan to be its cover siren.

Details of Moss’ much-anticipated wild wedding this coming weekend in England are being kept strictly under wraps. “They’re being psycho about keeping the details secret,” said one fashion source.

But word has leaked to us that Testino — who recently provided Vanity Fair with a previously unseen cover shot of Prince William and Kate Middleton after the royal wedding — will be shooting the nuptials between Moss and rocker Jamie Hince. (Alison Mosshart, Hince’s partner in the Kills, is expected to serve as his best “man,” our source added.)

Wintour should have a great selection of shots, provided Testino’s camera doesn’t get soaked in Champagne. The supermodel’s wedding at her Cotswolds estate is being dubbed “Mosstock” by locals since it’s expected to be a three-day bacchanal of music, A-list guests and unparalleled celebrations.

A more sober Lohan, meantime, was said to be shooting VF’s cover last weekend while under house arrest. “She just bleached her hair blond in preparation,” said a source close to the shoot at LiLo’s Los Angeles home.

PHOTOS: LINDSAY LOHAN

The article is expected to focus on “the new Lindsay,” according to sources — although it remains to be seen if the actress will be up to her old tricks once she’s legally allowed outside again at the end of June.

Reps for both Vanity Fair and Vogue declined to comment.