The big KISS theory: TV star Johnny Galecki and girlfriend Kelli Garner share a heated embrace in public

By Daily Mail Reporter

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He is normally one of Hollywood's more reserved performers, but TV star Johnny Galecki threw caution to the wind on Sunday.

The Big Bang Theory performer, 37, was spotted passionately kissing his girlfriend Kelli Garner as he arrived at the show's recording studio in Los Angeles, California.

Having just emerged from their car, the pair appeared every inch the romantic couple as they locked lips in full view of colleagues and on-lookers.

Getting close: Johnny Galecki and Kelli Garner kiss at Cecconi's - in full view of on-lookers

Getting close: Johnny Galecki and Kelli Garner kiss at Cecconi's - in full view of on-lookers

Wearing stonewash denim jeans with a tweed jacket, the veteran comedy actor could be seen puckering up for the kiss, which caused them to lose themselves.

Sporting fashionable stubble with his trademark hair and tortoiseshell glasses,he looked no older than when he appeared in classic Channel 4 comedy Roseanne in the early 1990s.

Meanwhile, girlfriend Kelli was suitably autumnal in dark blue jeans with a khaki, padded jacket. She also appeared with flame-red hair - a drastic change compared to her usual blonde locks - and also carried a simple black handbag.

Loose lips: Johnny Galecki and Kelli Garner share a very cosy embrace in an everyday moment

Loose lips: Johnny Galecki and Kelli Garner share a very cosy embrace in an everyday moment

Kiss me quick: The couple seem oblivious to the fact they are surrounded by other people

Kiss me quick: The couple seem oblivious to the fact they are surrounded by other people

Garner, who is also a successful actor and formerly appeared in the ill-fated TV series Pan Am, is nearly ten years younger than her beau.

The couple have been dating quietly for a 18 months but continue to keep their public appearances to a minimum.

Honeymoon period: Johnny Galecki and Kelli Garner clearly enjoy each other's company

Honeymoon period: Johnny Galecki and Kelli Garner clearly enjoy each other's company

Fondly remembered for his supporting role on Roseanne as Darlene's boyfriend, David, Galecki is a huge name thanks to CBS' The Big Bang Theory.

Currently in its seventh season and past the 140-episode mark, is up to an average 15.7 million viewers, according to Nielsen.

A key factor in the rise is its run in syndication on local stations and cable outlet TBS, which has helped to widen its exposure. Previously, it has even managed to beat American Idol in the coveted 18-49 demographic.

Galecki said to the LA Times of the coup: 'It's really shocking to me. I mean, Idol is event television, it's not something people really TiVo.

'I'm not sure how we got here. I almost don't want to question it. It only raises the bar for us.

'None of us feel like, 'Oh, we can relax.' But can you imagine what would happen if we had Jennifer Lopez on our show?'

Caught in the act: Johnny Galecki looks on as people see him kissing girlfriend Kelli Garner

Caught in the act: Johnny Galecki looks on as people see him kissing girlfriend Kelli Garner

Galecki also dated his co-star Kaley Cuoco, 26 , for two years and had romances with his Roseanne girlfriend Sara Gilbert and Laura Harris.

His most recent film project, he stars alongside Rupert Grint and Alan Rickman in CBGB. The film takes a look at the New York City punk-rock scene.

The comments below have been moderated in advance.

Just watched him in Christmas Vacation the other day, classic. He was a good actor even then.

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get a haircut you tramp

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The Big Bang guys and girls play their parts so well I find it hard to separate them from their characters. The newest series is one of the funniest yet! Big improvement on the last one.

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Al, you do realise when he was in Vanilla Sky he would have been 25? Or is that not a grown man to you? You need to work on your maths mate!

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Correct me if I'm wrong, but you can have a "heated argument" or "warm embrace", but not a "heated embrace" as the headline states?!

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Is her left eye slightly off?

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It looks like a staged photo op to me.

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She must be really short as he's only 5 foot nothing.

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Judging by the body language ... Honestly, I don't think it will last the distance. I hope I'm wrong he's a great guy. But, men don't need little girls as companions, lovers , wives. .... They need real women. ...

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David!!!!!!!!! What will Darlene say??

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