An attorney for Justin Bieber accuser Mariah Yeater today demanded that the pop star take another DNA test in connection with his client’s paternity claim — and this time he wants a Yeater attorney present to confirm the authenticity of the sample, E! Online reports.

Attorney Jeffrey Leving told the publication: "We have been negotiating a DNA test. We just received communication from Justin Bieber’s lawyer today concerning our discussions, which are private."

Leving added: "We are trying to set up a DNA test — to test the mother and the child and to retest Justin Bieber. Because we have to make sure the chain of custody is properly supervised.”

Leving said he was not aware that Bieber was taking a DNA test until he read about it. He added that he wants to get all parties tested in a supervised setting.

Bieber is set to appear on “Late Show with David Letterman” tonight. In clips that have surfaced ahead of the telecast, he comments on the paternity case, saying: "I think I could smell a weasel, too, a little bit. It’s pretty crazy — people make up false accusations.”