Music
Rex Features
The Conservative Party Mayor held talks with the popstar on Wednesday.
Speaking about the meeting, Johnson said: "I welcome her proposals and am keen to explore further how she can help us address this serious and distressing problem.
"There is nothing romantic or glamorous about knife crime and I'm delighted Lily will be using her considerable profile and fan base to spread that message."
Earlier this week, Allen and Oasis were linked to a knife crime awareness concert in Finsbury Park, which may take place in September.
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