Liv Tyler and Dave Gardner celebrate son's first birthday

Liv Tyler is a busy lady – but family always comes first. The star, who is currently pregnant with her third child, celebrated a landmark event this week as her youngest son Sailor turned one. "Happy birthday #1 my baby boy!!," Liv wrote alongside a photo of Sailor’s birthday cake, featuring a unicorn and a big number one, with his name written below in blue icing.

Sailor's family no doubt came together to celebrate his birthday in style. His grandfather is Aerosmith icon Steven Tyler, while his godfather is David Beckham, who is apparently very generous when it comes to buying presents for his godson.

Liv Tyler shared a photo of son Sailor's first birthday cake

Speaking on ITV's The Jonathan Ross Show in November, Leftovers actress Liv revealed: "He is very sweet, he gives very good presents! And he's a real gentleman, he's a very elegant person so very sweet… He loves being a father."

Sailor is Liv's first-born with fiancé Dave Gardner. Last month, the couple both announced the news that they are expecting their second child together, with messages posted on their Instagram accounts – just 11 months after Sailor's arrival.

Liv and Dave Gardner are currently expecting their second baby together

"Oh my goodness it seems the stork is visiting us again!!!! I am growing another little Tyler Gardner in my belly. Our family is growing!!! So grateful. @davidgardner I love you," the soon-to-be mother-of-three captioned a sweet holiday snapshot showing her cradling her tiny baby bump.

"My beautiful baby is pregnant !!!! Sooooooo excited and so blessed, I love you @misslivalittle ❤️," David commented alongside a different image of the blossoming star on the beach.

Liv's son Milo cuddling his baby brother

Liv is also a mother to 11-year-old son Milo, from her first marriage to Royston Langdon, and despite having experienced childbirth twice before, she admitted this week that she still finds the process pretty daunting.

"It's a wonderful, magic, amazing experience, but it's pretty scary – a lot of high stakes," Liv told the Evening Standard magazine.

"I nearly threw that Gina Ford [The Contented Little Baby] book out of the window. I cried," she said, adding that she needs "a lot of help" and that "it takes a village".