Robin Thicke Will BEG for Paula Back at Awards ... 'I Should've Kissed You Longer'

Robin Thicke is so desperate to get his wife back ... he WROTE A NEW SONG about it -- including the lyrics "I should've kissed you longer / I should've held you stronger" -- and TMZ has learned he'll debut it live on stage ... at the Billboard Music Awards.

According to TMZ has obtained a copy of the lyrics for the new song called "Get Her Back" -- and the whole thing is dripping with regret over his split from Paula Patton.Some highlights: "All I wanna do is make it right"-"I gotta get her, go get her back / I gotta treat her right / I gotta cherish her for life"

"I should've kissed you longer / I should've held you stronger / And I'll wait for forever for you."Robin's other public pleas to Paula opening up during concerts about forgiveness have fallen on deaf ears.If at first you don't succeed beg in front of a national TV audience Sunday night at 8:00 PM on ABC.
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