The paparazzi may have ruined Jackie’s surprise about her gorgeous engagement ring, but that hasn’t stopped her from revealing the heartbreaking story of why she is wearing it.
"Hadn't had the chance to tell this story with family and friends yet and we got 'papped' the other day," she wrote.
"So here it is. Knowing that Tim and I were unable to get the tattoo rings with me falling pregnant, Mum asked me if I'd be interested in her engagement ring.
"I was absolutely overwhelmed by this offer. She hasn't worn it in years and usually wears Dad's wedding ring now a he passed away a few years ago."
Jackie and Tim talk babies on Seven Year Switch...Post continues after video
Jackie continued that she was "honoured" by the "beautiful, sentimental" gift from her mother.
"[My parents] were together almost 50 years before he died and the diamond has been passed down for generations in her family. It is the most perfect ring in the world," she added.
Jackie and Tim - who appeared on controversial reality show Seven Year Switch - announced their engagement, and surprise baby news, during the show's reunion.