Answer:
1975
- Birth of Mr. Green
CeeLo Green was born in 1975.
- I'm MC Roman ML25
MCML is 1950 in Roman numerals, add 25 to get 1975.
- Water in the US
The Watergate scandal happened in 1975.
- Birth of Miss Pretty
Angelina Jolie ("pretty" in French) was born in 1975. (from @dmg)
- Birth of "Leonard"!
Johnny Galecki, who plays "Leonard" in The Big Bang Theory, was born in 1975. (from @IanMcDonald)
- Can you bend it like Hint 7?
"Can you bend it like Beckham?" referring to David Beckham, who was born in 1975. (from @IanMcDonald)
- The very first Viking
The Viking 1 probe was launched in 1975.
- Do you recall the Iron Maiden Torture device?
The band Iron Maiden was founded in 1975.
- Well, back then the UK wanted to be in EU
In 1975, the United Kingdom voted to stay in the European Economic Community.