Actualy baths, this is not the same thing - this is sampling - a different thing altogether.
Sampling is used when an artist lifts a riff, or a section, or a rhythm, or even a complete tune, and lays another vocal over it. The original artist will have given permission, and will have a royalty cut from sales, and usually an acknowledgement in the composer section of the recording details.
That is not the same as Blurred Lines, which blatantly copied the Marvin Gaye rhythm and overall atmosphere - that is a rip-off - for which their bottoms were righteously sued - successfully.