SBS Letters and Numbers host Lily Serna welcomes her first child

Letters and Numbers host Lily Serna welcomes her first child – as the mathematician cheekily announces ‘one final addition before the year is out’

Lily Serna and her fiancé, Blair Hickey, have welcomed their first child.

The 33-year-old mathematician, who is best known for co-hosting SBS game show Letters and Numbers, announced the happy news in an Instagram post on Tuesday.

‘One final addition before the year is out,’ she captioned a sweet photo of herself carrying the newborn at the beach.

‘One final addition before the year is out’: Letters and Numbers host Lily Serna (pictured) and her fiancé, Blair Hickey, have welcomed their first child

The Jerusalem-born TV presenter went ‘Instagram official’ with Blair in January 2017.

The couple announced they were expecting a child together in October when Lily was already heavily pregnant.

She wrote on Instagram at the time: ‘So there’s one more little thing that I’ve been working most of the year that I haven’t shared with you yet…

We're having a baby! The couple (pictured) announced they were expecting a child together in October when Lily was already heavily pregnant

We’re having a baby! The couple (pictured) announced they were expecting a child together in October when Lily was already heavily pregnant

‘I’m very excited to say that we’re expecting a baby very soon!’ 

Lily added: ‘What a year it’s been with the release of my book, Curious, next week as well as my Catalyst episode and now a little one. My head is spinning but we’re over the moon!’ 

It has certainly been a whirlwind year for Lily and Blair, who announced their engagement in January. 

 Loved up! The Jerusalem born Australian mathematician and her fiancé went Instagram official back in January 2017

At the time, Lily shared a gallery of photos to Instagram documenting her reaction to Blair’s proposal, which she described as ‘the many faces of love’. 

While Letters and Numbers was cancelled in 2012, repeats are still shown regularly on SBS and it remains a cult favourite.

The program was based on the popular British quiz show Countdown.  

How sweet! Lily also shared a gallery of photos documenting her reaction to Blair's proposal, which she described as 'the many faces of love'

How sweet! Lily also shared a gallery of photos documenting her reaction to Blair's proposal, which she described as 'the many faces of love'

How sweet! Lily also shared a gallery of photos documenting her reaction to her long-time beau Blair’s proposal, which she described as ‘the many faces of love’ 

Mathematics runs in Lily’s blood. Her father and brother are both engineers and her extended family includes analysts and maths teachers. 

She previously said that her father had told her when she was 10 years old to ‘always remember there’s no difference in mathematical ability between girls and boys’.

Lily’s other television credits include hosting cooking show Destination Flavour, which also aired on SBS. 

In 2016, she launched the podcast Decoding Genius, in which she ‘attempted to unlock the secrets of high intelligence’. 

Familiar face: While Letters and Numbers was cancelled in 2012, repeats are still shown regularly on SBS and it remains a cult favourite 

Familiar face: While Letters and Numbers was cancelled in 2012, repeats are still shown regularly on SBS and it remains a cult favourite