Nicole Trunfio completes her son Zion’s racetrack-themed birthday cake

Back at it! Heavily pregnant Nicole Trunfio completes her son Zion’s racetrack-themed cake ahead of his joint birthday party with sister Gia

Nicole Trunfio stayed up late on Wednesday finishing one of two cakes for her children ahead of their joint birthday party.

And on Thursday, she updated her Instagram followers on the progress of her son Zion’s cake, which had been left unfinished the night before.

In a series of videos, the heavily pregnant model documented the baking and decorating stages while working hard in the kitchen of her family ranch in Texas

Back at it! A heavily pregnant Nicole Trunfio completed her son Zion’s racetrack themed cake on Thursday ahead of his joint birthday party with younger sister Gia

Nicole iced several chocolate sponge cakes – which had been shaped into the number five, representing Zion’s fifth birthday on January 11 – with black frosting and black glitter to resemble a racetrack.

She then used the cream middles from Oreo cookies to create lines on the edible asphalt.

‘I’m really just making this up as I go with whatever I have. I’m not being too precious about it!’ she told fans.

Birthday boy! Nicole's son, Zion, will turn five on January 11

Birthday boy! Nicole’s son, Zion, will turn five on January 11

Decorating: Nicole iced several chocolate sponge cakes with black frosting and black glitter to resemble a racetrack

All in the details: She then used the cream middles from Oreo cookies to create lines on the edible asphalt

Decorating: Nicole iced several chocolate sponge cakes with black frosting and black glitter to resemble a racetrack. She then used the cream middles from Oreo cookies to create lines on the edible asphalt

Looks delicious! She went on to decorate the cake with toy cars, checkered flags, Junior Mints, liquorice and red sour rope

Looks delicious! She went on to decorate the cake with toy cars, checkered flags, Junior Mints, liquorice and red sour rope

She went on to decorate the cake with toy cars, checkered flags, Junior Mints, liquorice and red sour rope. 

Nicole then used green icing to pipe Zion’s name at the bottom of the cake. 

It comes after she documented her attempts on Wednesday night to make her daughter Gia’s Moana-themed cake for her second birthday, which is on January 15. 

'Wish me luck!' It comes after Nicole documented her attempts on Wednesday night to make her daughter Gia's Moana-themed cake for her second birthday, which is on January 15

‘Wish me luck!’ It comes after Nicole documented her attempts on Wednesday night to make her daughter Gia’s Moana-themed cake for her second birthday, which is on January 15

'She loves Moana!' For Gia's cake, Nicole baked several vanilla sponges, which she positioned in the shape of the number two and covered with blue icing to represent water

‘She loves Moana!’ For Gia’s cake, Nicole baked several vanilla sponges, which she positioned in the shape of the number two and covered with blue icing to represent water

Nicole baked several vanilla sponge cakes, which she positioned in the shape of the number two and covered with blue icing to represent water. 

She lined the edges with blue M&Ms and made edible sand out of crushed cookies.

Finishing off the elaborate design, Nicole threw on blue sprinkles and wrote her daughter’s name, ‘Gia’, using piped icing.  

Creative! She lined the edges with blue M&Ms, which added texture to the ocean, and made edible sand out of crushed cookies

Creative! She lined the edges with blue M&Ms, which added texture to the ocean, and made edible sand out of crushed cookies 

Family life: Nicole shares her daughter, Gia, and son, Zion, with her blues musician husband, Gary Clark Jr. The family is pictured here

Family life: Nicole shares her daughter, Gia, and son, Zion, with her blues musician husband, Gary Clark Jr. The family is pictured here

Time to celebrate! Nicole decided to throw a joint party for her two children because their birthdays are just four days apart

Time to celebrate! Nicole decided to throw a joint party for her two children because their birthdays are just four days apart

Nicole shares her daughter, Gia, and son, Zion, with her husband, Gary Clark Jr.  

She is currently eight months pregnant with their third child and due to give birth in the next few weeks. 

In 2017, Nicole sold her property in Dubbo, NSW, and purchased a ranch in Texas with her husband, where their family now lives. 

Growing their brood: Nicole is eight months pregnant and due to give birth in the next few weeks. Pictured in November, when she was 25 weeks pregnant

Growing their brood: Nicole is eight months pregnant and due to give birth in the next few weeks. Pictured in November, when she was 25 weeks pregnant