Pretty Little Liars star Shay Mitchell has announced she's expecting her second child with boyfriend Matte Babel.The American actress debuted her growing baby bump with an intimate topless snap showcasing her changing body on her Instagram page. Shay, who is already a mum to two year old son Atlas, shared a series of three images to announce her news.The 34 year old shot to fame on the hugely-popular teen mystery series in the early 2010s and later went on to appear in the first series of Netflix's hit You.The actress told her Instagram followers that she's “so excited” to meet her baby, but that the news is tinged with sadness because she's also experienced a loss as her grandmother recently passed away. Get exclusive celebrity stories and fabulous photoshoots straight to your inbox with OK!'s daily newsletter .