When it comes to celebrity feuds, you don't find many as bizarre as this one.
In one corner: "CSI: Crime Scene Investigation" actress Marg Helgenberg. A 52 year-old industry veteran with movies like "Bad Boys," "Erin Brockovich," and "Species" on her resume.
In the other: Seventeen year-old Canadian moppet Justin Bieber, who has ridden his singing chops and hairstyle to guest appearances on TV and movies. And a 3-D IMAX documentary about his life.
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In a recent radio interview, Helgenberger called Bieber a "brat," referencing the singer's guest starring role a couple of episodes of "CSI."
Well, now Bieber is firing back (via Twitter, of course).
"Its kinda lame when someone you met briefly and never worked with comments on you. I will continue to wish them luck and be kind," he wrote.
He continued: ""I know who I am and sometimes people r just going 2 say what they want. Keep ur head up and be the man ur mama raised." He's abbreviating words, so you know he's upset.
So far, there has been no further comment from Helgenberger.