'It's a boy!' Anna Heinrich's sister Andrea celebrates gender reveal party with her famous sibling and Tim Robards By Caleb Taylor For Daily Mail Australia Published: 04:59 BST, 11 June 2019 | Updated: 04:59 BST, 11 June 2019 Viewcomments Bachelor winner Anna Heinrich, 32, announced her sister Andrea is pregnant with her first child earlier this month. And Andrea celebrated her gender reveal party with her famous sibling in Sydney last week. In photos shared to Instagram, Andrea and her boyfriend Tynan Diaz looked thrilled to learn they're having a baby boy. It's a boy! Andrea Heinrich celebrated her gender reveal party with boyfriend Tynan Diaz in Sydney last week Andrea looked every inch the glowing mother-to-be in a brown pleated frock. Tynan was smartly dressed in a crisp white shirt and grey chinos and a pair of boots. Held at Centennial Homestead, the venue was decorated with large gold balloons spelling out the words: 'Oh Baby.' Guests, which included Anna's Neighbours star husband Tim Robards and Home and Away's Sam Frost, feasted on Barramundi, roast chicken and beef fillet. Adorable baby-themed cupcakes included icing with mini 'boy or girl' plaques and booties. Family affair: Andrea and Tynan posed with her mother and father, Judith and Les, along with Anna and Tim What a treat: Guests, which included Anna's Neighbours star husband Tim Robards and Home and Away's Sam Frost, feasted on Barramundi, roast chicken and beef fillet Cute: Adorable baby-themed cupcakes included icing with mini 'boy or girl' plaques and booties Earlier this month, Anna gushed over her sister's pregnancy, sharing a snap of Andrea and Tynan holding their first ultrasound scan. 'My sister is pregnant to this incredible man,' Anna wrote on Instagram. Andrea works as the executive assistant for legendary horse trainer Gai Waterhouse. Famous faces: Home and Away star Sam Frost (left) attanded. Pictured here with friend, Natalie Kelly In her announcement post, she revealed her due date is Wednesday, December 18. Meanwhile, Anna and Tim, 37, have been forced to delay their own baby plans due to work commitments. Tim, who moved from Sydney to Melbourne in March after landing a permanent role on Neighbours, told Woman's Day last month that his career is his priority right now. 'Next year would be a good time to make that happen,' he said, referring to the couple having children. The original Bachelor couple dated for four years before getting engaged in 2017. They married in Puglia, Italy in June last year. Celebrity circle! Andrea posed with a number of the pals, including Sydney socialite Kate Waterhouse ((left) Read more: Share or comment on this article: All rights reserved for this news site dailymail and under his responsibility