Interesting devolpment from the Beebs camp ... the lawyers have been UNLEASHED!

Our sources say Justin’s lawyer, Howard Weitzman, contacted Yeater’s attorneys Friday and conveyed the DNA test WILL happen. We’re told Justin and his team are so serious … they directed Weitzman to find a lab to do the test and Weitzman has already selected one.

Once the test shows Justin is not the daddy, Justin and his team will sue her. We’re told Yeater’s lawyers appeared “nervous” when they heard the news. This may explain why Yeater’s lawyers went underground yesterday and did not return TMZ’s calls.

Sources say Bieber and his team think it’s important to file a lawsuit against Yeater to show there are consequences when somebody trumps up phony, hurtful allegations against a celebrity.

Fair enough ... there has to be consequences, but if he IS the dad? Oh man, is he gonna look like a tool if they sue.