I found this list with the most famous and large astrological stellium ever, from 6 to 8 planets in one sign:
http://www.abovetopsecret.com/forum/thread953916/pg1
MY FAVORITES
Aquarius Stelliums:
Jennifer Jason Leigh (February 5, 1962): Sun, Moon, Mercury, Venus, Mars, Jupiter, Saturn, Midheaven, South Node all in Aquarius.
Clint Black (February 4, 1962): Sun, Moon, Mercury, Venus, Mars, Jupiter, Saturn, South Node in Aquarius.
Cancer Stelliums:
Pablo Neruda (July 12, 1904): Sun, Moon, Mercury, Venus, Mars, Neptune. (House 5 and 4)
Kurt Cobain (February 20, 1967): 8 planets in water signs, four of them in pisces.
http://www.abovetopsecret.com/forum/thread953916/pg1
MY FAVORITES
Aquarius Stelliums:
Jennifer Jason Leigh (February 5, 1962): Sun, Moon, Mercury, Venus, Mars, Jupiter, Saturn, Midheaven, South Node all in Aquarius.
In her films, Jennifer projects a dry, aloof, complete detachment from natural emotion with a sense of great ease. She is highly cerebral and quite unorthodox in these roles. She has a knack for playing playing women who seem pretty basic and well adjusted but are actually pretty quirky, weird, or even insane; women who have a very difficult time relating to the emotions of others. (Source: astrophilosophy)
Clint Black (February 4, 1962): Sun, Moon, Mercury, Venus, Mars, Jupiter, Saturn, South Node in Aquarius.
Axl Rose (February 6, 1962): Sun, Mercury, Venus, Mars, Jupiter, Saturn. (House 10)Clint Black is a bit of a rebel in the country music world. Unlike most artist in that genre, he is known for writing all of his music on every album. After sifting through some his songs on A-Z Lyrics I would have to agree with his fans that he is a pretty skilled lyricists with a sophisticated and unique handle on wordplay. (Source: astrophilosophy)
I'm not very familiar with Axl Rose's personal life, he's apparently very intelligent but he has an abusive history with women (including rape and domestic violence charges), his moon is in pisces, a clear contrast between hypersensitivity and extreme detachment.
Cancer Stelliums:
Pablo Neruda (July 12, 1904): Sun, Moon, Mercury, Venus, Mars, Neptune. (House 5 and 4)
Not exactly a stellium but still remarkable:Neruda was extremely self-indulgent, he loved food (he has many poems dedicated to this subject) and interior design (all his houses have a magical quality to them, I've visited two of them and he had great taste, very unique and full of stories). He was also a womanizer and deadbeat father.
Kurt Cobain (February 20, 1967): 8 planets in water signs, four of them in pisces.
It's safe to say that everyone is familiar with Kurt Cobain's personal life, tragic death and addictions but this part in his suicide note caught my attention: "I must be one of those narcissists who only appreciate things when they're gone. I'm too sensitive. I need to be slightly numb in order to regain the enthusiasms I once had as a child. (...) I think I simply love people too much, so much that it makes me feel too ******* sad. The sad little, sensitive, unappreciative, Pisces, Jesus man. Why don't you just enjoy it? I don't know!" Curiously, he tortured a cat when he was a teen.