Can’t beat ‘Rihanna’ on ‘L&O’

Paging Rihanna: “Law & Order” thinks you should dump Chris Brown. The NBC show’s upcoming “My Funny Valentine” episode suspiciously features two pop stars in a violent love affair. Gorgeous star “Joi,” played by Starshell Menzies, is regularly beaten by her hip-hop singer boyfriend “Caleb Bryant,” played by Eugene Jones…