Full of youthful exuberance! Sarah Silverman grins with glee at airport... after being mistaken for Kate Beckinsale's daughter

It is a case of mistaken identity that surely put a smile on her face.

So no wonder Sarah Silverman was looking so upbeat at a Los Angeles airport on Tuesday after incorrectly being taken as being the daughter of Kate Beckinsale on social media.

The self-styled comedienne looked full of the joys of life as she got ready to jet out of California.

Easy mistake to make: Youthful Sarah Silverman was looking so upbeat at a Los Angeles airport on Tuesday after being mistaken as the daughter of Kate Beckinsale

Easy mistake to make: Youthful Sarah Silverman was looking so upbeat at a Los Angeles airport on Tuesday after being mistaken as the daughter of Kate Beckinsale

The 46-year-old looked typically youthful in a woolen jacket, T-shirt, ripped jeans and trainers. 

And it seems the funnywoman has been secretly sipping away at the Fountain Of Youth, as she still looked far from her age despite opting to go makeup free.

It is certainly no surprise the beauty was recently mistaken to the the daughter of her lover's former partner.

The hilarious case of erroneous identification came when Kate Beckinsale, who is three years younger than the comic, posted a picture of them both out to dinner with a large group of friends on Saturday.

Drinking at the Fountain Of Youth? It is easy to see why the youthful beauty was mistaken for being the daughter of Kate Beckinsale

Drinking at the Fountain Of Youth? It is easy to see why the youthful beauty was mistaken for being the daughter of Kate Beckinsale

Moving up in the world: The sprightly starlet seemed thrilled to be heading on her way after going up the escalator

Moving up in the world: The sprightly starlet seemed thrilled to be heading on her way after going up the escalator

What's her secret? Even Sarah seemed at a loss to explain why she looks so young

What's her secret? Even Sarah seemed at a loss to explain why she looks so young

A jolly fan asked the Underworld actress on Instagram: 'That Sarah is your daughter? Pretty like you @katebeckinsale.'

Despite being actually being younger than her ex's latest lover, glamour girl Kate saw the funny side, replying: 'Granddaughter. We are very proud of her.'

Adding to the unmitigated hilarity of the mix-up, Sarah is actually the long-term partner of Kate's ex Michael Sheen.

Kate and Michael have a daughter together, 18-year-old Lily Mo Sheen, and Sarah has long been involved in her life.

Fresh as a daisy: The comedy beauty was looking as good as ever despite being makeup free

Fresh as a daisy: The comedy beauty was looking as good as ever despite being makeup free

And off she goes: No doubt she could hardly wait to catch up on beauty sleep on her flight

And off she goes: No doubt she could hardly wait to catch up on beauty sleep on her flight

'She's your daughter?' Kate Beckinsale was mistaken for Sarah's mother after posting this snap on social media

'She's your daughter?' Kate Beckinsale was mistaken for Sarah's mother after posting this snap on social media

Hilarious anecdote: No doubt Michael Sheen will laugh when he learns how his lover was mistaken for being his ex's daughter

Hilarious anecdote: No doubt Michael Sheen will laugh when he learns how his lover was mistaken for being his ex's daughter

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