Actress Scarlett Johansson and her boyfriend Colin Jost made their first public appearance as a couple while attending the American Museum of Natural History Gala. The pair reportedly graced the red carpet separately, but posed for photographs together at the event. Johansson was seen wearing a strapless red vintage satin gown. Meanwhile, her boyfriend donned a black tuxedo. "They're very much in love. It's serious. They're both very respectful and supportive of each other's careers. It took them a while to be exclusive but they are now. They are super cute together!" a source revealed.