1. Which married Oscar nominee has been cheating on his wife with a hard-partying starlet? (Source)

2.
This is actually from the day prior to the Academy Awards, but it
happened in the theatre so I think that is close enough. So, this actor
who is A list all the way but has never been nominated for anything
that great had a part in the actual show telecast. Comic actor. Mostly
movies. Apparently though on Saturday he decided that it was his role
to piss everyone off with his behavior. He yelled at the writers of the
show saying their work wasn't good enough for him and made them change
his lines three times. Surrounded by people who had been working almost
24 hours straight doing backbreaking work, our actor who spent a grand
total of one hour at the theatre started snapping his fingers when it
was time for him to rehearse and yelling that he had places to go and
didn't have time to sit around waiting. I really hate the whole
snapping the fingers thing. He seems to like it though. (Source)

3.
With A/B list Co-stars were in the bathroom of the Oscars sharing phone
numbers of their dealers? When our spy went to use the restroom, she
heard the two beauties talk about buying cocaine as if they were
sharing info about their favorite baby sitters. Which wouldn’t surprise
you that the nanny of one of the Actresses is who supplies her with any
substance she needs, and according to the Actress is great with the
kids too! Our spy seemed to be the only one mortified by the subject in
the room and her appalled looks were returned with rolled eyes. It’s
not Sarah Jessica Parker. (Source)

4.
Which Oscar-nominated actress let loose a string of obscenities at one
of the Academy Awards after parties? She looked gorgeous in her long
gown, and simply glowed the entire evening. However, the party was
crowded, and a famous actor accidentally stepped on the train of her
gown. She let out a little shriek, and the man sheepishly apologized
and moved his foot. Instead of reacting graciously to the error, our
normally well-behaved actress tugged her train towards her and swore
loudly enough for several people to hear. (Source)

5.
Which diva threw a massive hissy-fit when she found her bloke chatting
up a blonde waitress at a pre-Oscars party? She had her driver take him
home immediately, while she carried on partying...(Source)

Take your guesses!! :)

ONTD