The cast and director of Oscar-winning “The Artist” partied all night Sunday before appearing on morning TV without going to bed. With their five awards, the cast including Jean Dujardin and director Michel Hazanavicius celebrated with Harvey Weinstein at all the top bashes, including their own at the Mondrian Hotel attended by nearly 1,000 guests. “Then we did ‘Today’ at 4 a.m., followed by CBS and then Kelly Ripa’s show,” Weinstein told us. “Jean then had to get on a flight to Paris. I’ve had an hour and a half sleep, but we are all very, very happy.”