Johnny Galecki has secretly got married and had a second baby. The ‘Big Bang Theory’ actor – who has son Avery, four, with ex-girlfriend Alaina Meyer – has welcomed baby girl Oona Evelena into the world having quietly tied the knot with his now wife Morgan Galecki. The news was revealed by Architectural Digest magazine as part of an interior design interview with the 48-year-old star. While the piece referenced his wedding and the birth of his baby girl – and even shared a photo of her nursery – it’s not known when he and Morgan tied the knot, or when their daughter was born. Johnny – who play…