The former child star sparked outrage when she cavorted with chart-topper Robin Thicke while wearing skimpy, flesh-coloured rubber underwear at the televised ceremony on Sunday night (25Aug13).
The jaw-dropping routine has provoked an official complaint from U.S. pressure group the Parents Television Council and a wave of criticism from reviewers.
One national British newspaper has even branded the former Hannah Montana actress "an international laughing stock" over her antics, but Lambert - who sparked controversy at the American Music Awards in 2009 with a gay kiss during his routine - is backing Cyrus.
The American Idol runner-up took to Twitter.com to write, "Listen if it wasn't ur (your) cup of tea - all good but why is everyone spazzing (sic)? Hey - she's doin something right. We all talkin (sic)... I didn't actually state whether or not I liked MileyCyrus performance. I merely said she was having fun and to cut her some slack."