The beginning is intentional; it's not a rip off or anything. Drake's "Take Care" samples Jamie xx's (Jamie xx is the one who does the percussion in The xx) song, "I'll Take Care Of U." So they're actually sampling Jamie, if anything.
Jamie xx - I'll Take Care Of U: http://www.youtube.com/watch?v=PaXslpx3MWY
Whole album is great, you guys definitely should check out Jamie xx's stuff if you guys like that song.