The Argentinian model was taken into custody this morning following the incident, which is thought to have taken place in the early hours of this morning after he asked some guests to leave his house.
A spokesperson for Leandro said: "We can confirm that Leandro Penna was arrested in the early hours of this morning near his central London home. Leo was detained following an apparent altercation with another male at his London home.
"It is our limited understanding that following a gathering at Leandro's home, guests were asked to leave at around 5am, it is then the alleged incident is said to have taken place."
Leandro was seen last night at will.i.am's foto-sosho launch party,where he was pictured partying alongside TOWIE's Lauren Pope and 'I'm A Celebrity...Get Me Out Of Here' star David Haye.
He also looked like he was having a lot of fun with Olympic diver Tom Daley, who he has apparently signed up to star alongside in celebrity diving show, 'Splash'.
Katie Price was quick to Tweet about the alleged incident, writing: "Just had a phone call...someones been arrested at last his true colours are being shown."
[Related story: Leandro Penna reportedly signs up to Tom Daley's TV show]
[Related story: Katie Price 'Leandro gave my cystitis. Err TMI]
[Related story: Tom Daley and Lauren Pope leave will.i.am's party holding hands!]
Meanwhile Olympian Tom Daley and The Only Way Is Essex star Lauren Pope set tongues wagging by leaving will.i.am's party HAND HOLDING.
The unlikely pair clutched each other's hands as they exited One Marylebone.
And DJ Lauren got cyberspace even more excited when she tweeted that she was in the mood for strip poker.
Good thing Tom's used to getting his kit off.