Glitz, glamour and gowns dominated the Oscar's red carpet, but by night's end it was a very unlikely romance that was the talk of town.

Model Petra Nemcova set tongues wagging after she was spotted cosying up to Sean Penn at Elton John's A-list party.

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Romance? Model Petra Nemcova kept close company with Sean Penn at Elton John's 16th Annual AIDS Foundation Oscar Party last night at the Pacific Design Center

Unlikely duo: the pair arrived at the event arm-in-arm

The 28-year-old arrived arm-in-arm with the 47-year-old star, who recently split up with his wife, Robin Wright Penn, after 11 years of marriage.

Petra ended her relationship with singer James Blunt last year. The 2004 tsumani survivor was previously engaged to British photographer Simon Atlee, who died tragically in the disaster.

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VIP: Simon Cowell and girlfriend Terri Seymour turned out for the singer's bash

Brits out in force: Girls Aloud star Nadine Coyle attended Sir Elton's bash, along with Susannah Constantine and Trinny Woodall

X Factor host Simon Cowell and girlfriend Terri Seymour turned out to support the British host along What Not To Wear stars Trinny Woodall and Susannah Constantine .

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Costume change: Heidi Klum, with husband Seal, slipped out of her dramatic red gown into a sexy silver number for the afterparty

Sealed with a kiss: Heidi plants one on her husband

Best Actress winner Marion Cotillard, toting her Oscar gong, mingled amongst the crowd, which also included Sharon Stone, Heidi Klum, Kate Beckinsale, Ellen DeGeneres and girlfriend Portia de Rossi.

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Winners and grinners: Sir Elton John with Best Actress Marion Cotillard

Star power: Helen Mirren and Javier Bardem attended the Governor's Ball, along with George Clooney and girlfriend Sarah Larson

Across town, stars also gathered at the Governor's Ball, held at the Renaissance Hotel in LA.

Pregnant Cate Blanchett was in the mood for fun, enjoying a playful moment with actor Viggo Mortensen, while George Clooney spent the night alongside his girlfriend Sarah Larson.

Helen Mirren and Best Supporting Actor Javier Bardem chatted away, while Best Actress Tilda Swinton made time for a sugar fix, digging into a chocolate dessert.

Taking a break: Daniel Day-Lewis with wife Rebecca Miller; Tilda Swinton stops for a sugar fix at the Governor's Ball

Three's company: Sharon Stone with Ellen Degeneres and girlfriend Portia De Rossi

Resplendant: British actress Kate Beckinsale also attended Elton's scene-to-be-seen post-Oscars party last night