Pop star is expected to testify at assault hearing on Monday (June 22)
He accuses pop star of invading his privacy
She is required to answer questions in Chris Brown's case
Her attorney says she will be present at hearing
Singer is seen kissing new friend at New York bowling alley
Her alleged attacker denies any involvement in leak<br />
Event management says gig is "not appropriate timing"<br />
Borrowed bling will be returned to her after hearing
The pieces are valued at $1.4 million
'Disturbia' singer will perform a set in Dubai