Brandi Glanville on Wednesday took to Twitter to address a hostile text message exchange she had with her son's ex-girlfriend, Bella Bernhardt.'NOT SORRY!!! Mama Bear to the end,' the 49-year-old reality star said on the social media site. 'That is all I’m going to say on the subject happy Wednesday.'The Salinas, California native spoke out after Bernhardt, 18, posted to social media an Instagram DM exchange that took place this past April.