The 21-year-old singer recently split from Twilight star Ashley Greene, and is said to be gagging to catch up with Harry Potter star Emma.
According to The Mirror, Jonas wants to try and hook up with Watson, 21, while he is in London promoting his latest single See No More.
A source told the newspaper, 'Joe has booked two suites at the Marylebone Hotel.
'He is asking his people to get a BlackBerry messenger number to invite Emma over to party with him and his crew. He thinks Emma is mesmerising and won't give up the chase.'