Bikini clad Margot Robbie caught kissing a sexy heartthrob on movie set (and it's not Will Smith...)

PUBLISHED: 12:14 EST, 5 December 2013 | UPDATED: 13:55 EST, 5 December 2013

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Margot Robbie - dressed in a sexy bondage style black bikini with spiked heels - was caught in a loving lip lock on Wednesday in Buenos Aires.

But the recipient of the 23-year-old's affections was not her co-star Will Smith, 45, who she's been spending time with both on and off the set of their film Focus as his wife Jada Pinkett Smith, 42, vacations thousands of miles away in Hawaii.

Rather, the actress was in the arms of Brazilian heartthrob Rodrigo Santoro, 38.

Where's Will Smith?: Margot Robbie was spotted in the arms of Brazilian heartthrob Rodrigo Santoro on Wednesday while shooting a scene for the romantic comedy Focus in Buenos Aires.

The actors were filming a scene for their new romantic comedy, about a veteran grifter, played by Will, who teaches the ropes to a attractive newcomer, played by Margot.

Wednesday's setting was a hotel pool side and Rodrigo - who wore white jeans and a black beaded necklace, and nothing else, showing off a toned torso - looked intent on seducing the alluring Australian as he offered her a glass of chilled champagne.

The hunk appeared very comfortable as he put his hand on Margot's naked backside, pulling her in for the smooch.

Touching moment: The Australian actress had her hands all over the shirtless looker

Both seemed to be in good spirits, and at one point Margot smiled to onlookers that included several young dark-haired men and women.

Earlier Will had shot a scene from the hotel's balcony, so he had been on the premises on Wednesday. But he was nowhere to be seen when his comely co-star was filming her passionate scene with Rodrigo.

On Monday Will was spotted with his arm around Margot while they shot a romantic scene at an outdoor cafe.

Smiling through it all: The blonde seemed to be enjoying her co-star's company as he offered her a glass of chilled champagne

Looking serious, the two sipped red wine at a small wood table with flowers on it as they talked privately.

When the cameras were turned off they looked happy as they joked around.

Over the weekend - which was the Thanksgiving holiday - Will and Margot spend some private time together on a boat that putted along the winding Lujan River in Tigre, close to capital city Buenos Aires.

Looking for Will?: The 23-year-old seemed to be searching for someone as her hunk reclined on his lounge chair

While Margot didn't appear on deck, choosing instead to stay inside the luxury boat, Will was seen walking around, showing off his toned chest in an unbuttoned shirt.

He seemed happy and relaxed as he conversed with friends.

It's been rumoured that Will and Margot are more than co-stars, but she has denied it, saying the reports are 'ridiculous.'

Bonding: Will and Margot shot a romantic scene on Monday at an outdoor cafe

Last month Star magazine publishing photos of the co-stars lifting their shirts as they posed together in a photo booth. Will was exposing his bare torso while Margot showed off her lingerie.

The last time Will was seen with his wife was in Las Vegas on November 10.

The reportedly held hands and kissed as they celebrated Will's son's 21st birthday at Hakkasan inside the MGM Grand Hotel.

The two smiled as they sat next to each other. Their two children Jaden and Willow were also in attendance.

Over the weekend Jada showed off an enviable bikini body as she walked on the beach in Hawaii with daughter Willow.