In what is quickly becoming an uglier feud by the day, Oksana Grigorieva has apparently told Sheriff's deputies Mel Gibson threatened her - with a gun.

The L.A. County Sheriff's Department is investigating the actor for alleged domestic battery, assault with a deadly weapon and child endangerment.

The investigation is based on the following:

* Domestic Violence: Oksana alleges Mel punched her in the face twice, knocking out a tooth and chipping another one. Mel's lawyers deny this.
* Assault with a Deadly Weapon: Oksana told deputies Mel threatened her with a handgun at his Malibu home, an allegation based on her word.
* Child Endangerment: Oksana claims that on January 6 of this year, Mel allegedly punched her in the face while she was holding their daughter.

As we reported earlier today, Mel's lawyers will likely present evidence to deputies that Oksana made up some of the stories and tried to extort him.

The couple - who had a quickie wedding in Las Vegas in February - celebrated their union by inviting nine drag artists to perform a number of classic disco tunes including Gloria Gaynor's 'I Will Survive' and Cyndi Lauper's 'Girls Just Want To Have Fun' on stage at their reception.

Katie had lined up the performers to entertain her, while a martial arts team were signed up to perform for Alex, although the cage-fighter - who is also known to enjoy dressing up in women's clothing - is said to have enjoyed the singers more than the fighters.

A source said: "Alex enjoyed the drag artists more than she did."

When a cage-fighter friend of Alex, 34, tried to get on stage to join in, he was embarrassed by the drag acts.

The insider revealed: "A drag queen threw him off."

The ceremony was not all fun and games, however, with police called to the event following trouble with photographers trying to get pictures of her dress - something which left Katie, 32, "shaken and upset".

A spokesperson said: "She was understandably shaken and upset by the actions of these people."