Anna Faris sparked concern after appearing at the Spa Day premiere in Las Vegas on Saturday night. The 49-year-old actress – who raised fears after a public appearance in June – left fans worried about her demeanor during a red carpet interview with E! News. Faris was answering a question about parenthood when some social media users expressed concern, with one asking, 'Is she ok?' 'What is up with her demeanor? Something's not right,' another wrote underneath the clip. More than one person wrote online that the longtime entertainer's eyes appeared red and 'bloodshot.' The star shares son Jack, who turns 14 on August 17, with ex-husband…