Justin Bieber Alleged Baby To Take DNA Test?

Attorney Jeffrey Leving tells TMZ ... his client is NOT avoiding the DNA test, and can't wait to compare baby Tristyn's DNA with Justin Bieber's.

But Leving says he DOES have a big problem with the DNA test Justin has already taken, because a member of Yeater's team was not present while it was administered and he has no idea if the test was done using proper controls.

Although members of Justin's team have told TMZ Yeater and her team had gone radio silent since Justin took the test on Friday, Leving says his co-counsel has been in touch with Justin's lawyer, Howard Weitzman, Monday and Tuesday. Leving says he hopes both sides will reach an agreement on a DNA protocol.