Sienna Miller seems to have taken a fashion turn for the worst as she’s seen back in London on Tuesday, strolling out and about without boyfriend Rhys Ifans.

On her way from LA to London, Sienna and Rhys made out mid-air, according to the Mirror.

The couple did a bit of play-flighting and making out during their 12-hour Virgin Atlantic flight. Other passengers were disgusted, especially when Rhys jumped into Sienna’s single bed and began a session of heavy petting.

They did stop only to catch a few minutes of the on-air movie, Michael Clayton! God bless that Clooney…

G.I. Joe star Sienna Miller and boyfriend Rhys Ifans jet out of LAX airport in Los Angeles on Monday, following a weekend of awards shows and parties.

Although Sienna didn’t attend the Oscars, she did manage to make her way down the blue carpet at the 2008 Film Independent’s Spirit Awards.

And why is Rhys sporting a mullet-like hairdo and and a pornstache-ish look?!

Si, 26, recently commented on her experience filming the G.I. Joe movie: “It is really fun, and I get to really kick some butt. I am working out a lot and kickboxing and all that. But the best bit is that I’m doing that gun-twisting stuff. I am learning how to shoot properly and it’s all cool and a lot of fun.”

10+ pictures inside of Sienna Miller ready to kick your sorry butt… More Here! »

G.I. Joe star Sienna Miller, aka The Baroness, plays it safe in black at the 2008 Film Independent’s Spirit Awards held at Santa Monica Beach on Saturday in Santa Monica, Calif.

Pictures of Sienna, 26, filming G.I. Joe: The Movie surfaced earlier this week. They showed Si mourning the loss of a loved one. Strangely enough, her hair was still blonde (The Baroness typically has jet black hair).

WHAT DO YOU THINK of Sienna’s blue carpet look — YAY or NAY?

15+ pictures inside of Sienna Miller @ the 2008 Film Independent’s Spirit Awards… More Here! »

A shy Sienna Miller hides her face from paparazzi as she makes her way though LAX airport in Los Angeles on Monday.

When Si finally made it to her car, she freaked out by flailing her arms and warding off photographers with her Zufi Alexander handbag. Excellent choice for attack.

Ms. Miller quickly dove into the backseat head first. A perfect ten dive!

10+ pictures inside of Sienna Miller’s photographer freakout… More Here! »

Sienna Miller (in Dior) arrives at the Orange British Academy of Film and Television Arts (BAFTA Awards 2008) at the Royal Opera House in London on Sunday.

Sienna, 26, is nominated for The Orange Rising Star Award, with the winner voted for by the public. Also up for the award are Shia LaBeouf, Ellen Page, Sam Riley and Tang Wei.

UPDATE: Sienna lost out to Shia LaBeouf.

Sienna Miller glams up the The London Film Critics’ Circle Awards at the Grosvenor House Hotel in London on Friday.

The 26-year-old G.I. Joe actress wore a classy black floor-grazing gown with interesting shoulder straps and a very ornate brooch to boot. More Here! »

Proud pet-owner Sienna Miller chats on her cell phone while taking her dogs Porgy and Bess out for a walk around her London neighborhood on Friday.

Sienna, 26, had been scheduled to promote her new movie The Mysteries Of Pittsburgh at this month’s Sundance Film Festival in Utah. UK’s The Daily Mail claims Sienna was trying to avoid Sadie Frost, the ex-wife of her old flame Jude Law. Other media reports claim Sienna was too choked up about the death of her Casanova costar Heath Ledger.

10+ pictures inside of Sienna, Porgy and Bess… More Here! »

Sienna Miller steps out in London on Thursday, leaving boyfriend Rhys Ifans behind to walk her dogs again.

Rhys Ifans, professional dog walker, now for hire!

Sienna, 26, was close to her Casanova costar Heath Ledger. No public statement about her reaction has been issued by Sienna or her reps yet. More Here! »