You may remember that back in December, Khloé Kardashian finally confirmed her pregnancy after three months of speculation. View this photo on Instagram instagram.com She announced the news with this lovely photo and long caption detailing how happy she and boyfriend Tristan Thompson were to be expecting. View this photo on Instagram instagram.com Now, because she was wearing a Calvin Klein bralet in the photo, there was a lot of speculation at the time that the photo was a paid advert for the company. instagram.com Or, at the very least, was an elaborate photo shoot that had been carefully planned and executed to maximise interest in the pregnancy. However, Khloé has now revealed the story behind the photo – and it turns out that it was taken completely spontaneously. View this photo on Instagram instagram.com Writing on her website, Khloé With A K, the reality star explained that she and Tristan posed for the photo at home while her friends and makeup artist directed the shoot. View this photo on Instagram instagram.com She said: "One day when he [Tristan] came home from practice, we decided to just do it! Simon took the photo and Savas was on the phone with Hrush and they were directing the placement of our hands. Our heads were cropped out because we both looked crazy, LOL." She went on to say that the photo wasn't planned or strategised, but a personal way for the couple to share their news. View this photo on Instagram instagram.com Khloé explained: "Everyone thought this was some strategic picture, but in fact I think we got it done in 20 seconds – and it was just done by us." So now we know. 💕 Tap to play or pause GIF Tap to play or pause GIF Tap to play or pause GIF Tap to play or pause GIF E!