The pop star is expecting her first child with her long-term partner Justin Scott, and Walsh has now revealed she took a test at the very beginning of the year and rounded off the festive celebrations with some very special news.
She tells Britain's Ok! magazine, "We found out on New Year's Day. It was very much like 'Happy new year!' It was actually a really nice way to start the year as I usually feel a little bit lost, but I pretty much knew what this year was going to be about straight away."
Walsh goes on to reveal she struggled to keep her baby news a secret over the first three months, and feared she would be discovered if she refused an alcoholic drink at the BRIT Awards in February (14).
She adds, "I was squeezed into my dress and hadn't told my stylist... so she must have just thought 'Stop eating!' Also, I was on a table with journalists and I thought, if they end up guessing tonight it's going to be really annoying, so I did the trick of having a glass there and pretended to sip on it, and people don't really pay attention."