The final show of the long running comedy will go out on Friday 28 May, followed by a new set of housemates for the reality show at 10pm.
About 50 million people in the US tuned in for the last episode of Friends when it was shown on 6 May.
A spokesman for Channel 4 said the timing of the Friends finale was a "very happy coincidence".
Friends star Matt LeBlanc will carry on playing Joey in a spin off called Joey, all about the loveable dimwit.
Last year's BB was criticised for having "boring" contestants.
The number of people watching it dropped, and for the first time the final got fewer viewers than the start of series.