Kiss for the birthday girl! Justin Theroux showers Jennifer Aniston with affection in front of celebrity friends as she turns 43

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By Alanah Eriksen

Sealed with a kiss! Jennifer Aniston celebrated her 43rd birthday with a kiss from boyfriend Justin Theroux at Chateau Marmont in Los Angeles

They're not known for their public displays of affection.

But Justin Theroux wasn't shy about showering Jennifer Aniston with kisses in front of their celebrity guests as he threw her a 43rd birthday party.

The actor and screenwriter was spotted being very affectionate on Saturday with the actress on the roof of the Chateau Marmont on Sunset Boulevard where the bash was held.

They snogged and cuddled as A-listers including Courtney Cox, Jason Bateman and Emily Blunt and her actor husband John Krasinky looked on.

Jen's best friend, talkshow host Chelsea Handler, was also there along with other show hosts Jimmy Kimmel and Joel McHale and Christine Taylor, the actress wife of Ben Stiller.

But Jen will have disappointed a few fans after she was spotted lighting a cigarette on the balcony of the party.

Shesaid in December she had quit smoking 'a few months ago' and put on weight because of it.

A source told OK! magazine Jennifer was having a great time at her party.

He's mine! The pair, who have been dating for nine months, couldn't keep their hands off one another

Like no one else exists: Justin looks lovingly at his A-list girlfriend amid the hustle and bustle of the party

'She was so excited and made lots of sounds and had a puppy-dog look on her face.

'Justin and Jennifer kissed and hugged and were very affectionate with each other.

They were both welcoming guests in to the party together. They were just relaxing and she was opening up gifts'

Justin had gone all out for the party with their own private bar, tents erected, heaters going, candle decorations and music including Adele, hip hop and jazz.

Comfortable in each other's company: The former Friends star puts a hand on her man's shoulder as they take a break together at the party

Celebrity friends: The party was also attended by Emily Blunt, Courtney Cox and Jason Bateman

The birthday girl looked gorgeous but wasn't drinking alcohol, the source added.

'Jennifer was wearing a black dress, no sleeves, hair down, like she usually has. Justin was wearing a white long-sleeved button-down shirt with suspenders. She was not drinking at all, all night.'

But the A-lister did enjoy a cigarette.

Jen has smoked for several years, but told the January issue of InStyle: 'I quit smoking a few months ago and I put on a couple of pounds. Normally I’d be like "Oh my god, I gained weight. Everyone is going to think I’m pregnant." Now, I just don’t care.'

She had vowed back in 2002 to 'eventually quit smoking'.

Jen's ex-husband Brad Pitt also smokes and it was reported recently he had to hide the habit from his current partner, Angelina Jolie.

Creature of habit: Jennifer takes a cigarette break at her party after saying in December she had quit

Thanks for coming: The actress kisses a party guest as Justin looks on

Meanwhile, the movie Jennifer and Justin met on is about to be released to theaters.

In Wanderlust, Jennifer and Paul Rudd play a married couple in who escape modern society by leaving their cushy lives in New York. Justin plays a supporting role.

Meanwhile Jennifer has gushed to InStyle about her man's look, and defended their often-matching attire.

Asked what she likes about his fashion sense, she said: 'First of all, he has great style – it's very specific and it has been his style forever.'

Good food? The couple tuck into their meal

Chilling out: Justin takes a bit of time out by himself on the balcony

'I know people say ... 'Oh, look, you're dressing alike.' And I think, No I'm not. I've had this jacket for three years!'

She also spoke out about Brad's relationship with Angelina, insisting she holds no grudge toward her.

Answering a question about what the press gets most wrong about her, she said:

'The triangle with my ex-husband – and that there's a feud there. It's constant.

It's a story headline that won't go away, but it's a money thing.'

She added that people in the media make money off 'a story that has nothing to do with reality'.

Swanky venue: the party was held at the Chateau Marmont on Sunset Boulevard

Despite turning 43, she said she still felt young.

'You know what makes me feel old? When I see girls who are 20-something, or the new crop of actresses, and think "Aren't we kind of the same age?"

'You lose perspective. Or being offered the part of a woman with a 17-year-old child. It's like, "I'm not old enough to have a 17-year-old!" And then you realize, well, yeah, you are.'