Sinitta , 62, has shared snaps of her rarely seen son as she marks his 20th birthday with an emotional tribute. Celebrating her son's 20th trip around the sun, Sinitta shared several images of him, with a range of snaps from his childhood, and some more recent shots taken with his sister at a formal black tie event. 'Happy Birthday My Beautiful Boy @zac_willner," penned the So Macho singer. "20 years old does not seem real. You are the gentle giant, affectionate , kind, smart and funny and so