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Brooke Hogan will be in attendance at the premiere of Bubba The Love Sponge 's Hulk documentary later Friday ... this despite her brother, Nick , suing the radio personality over the work.

Hulk's daughter tells TMZ Sports there are several reasons why she'll have a seat in Tampa, Fla for the first screening of "Video Killed The Radio Star: The Untold Story Of The Hulk Hogan Sex Tape Scandal" -- with No. 1 being she's loyal to Bubba. Gallery Launch Gallery Getty

She told us the shock jock -- real name Todd Clem -- "helped our family a TON over the years and I know he was a true friend to my dad. My brother and I knew him as 'Uncle Bubba.'"

Secondly, Brooke said she's seen the doc -- and believes it tells the true tale

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