Renée Zellweger sings ‘Over The Rainbow’ in first teaser for ‘Judy.’

Renée Zellweger plays Judy Garland during a 1968 London nightclub run in “Judy,” due out in September. (Image: ROADSIDE ATTRACTIONS/LD ENTERTAINMENT)

Renée Zellweger should put to rest any doubts about her portrayal of Judy Garland in the new biopic “Judy” with the film’s first trailer, in which she sings Garland’s most beloved song, “Over the Rainbow.” 

Zellweger’s take on the classic ballad is…