TABLOID TRASH - GWEN STEFANI AND BLAKE SHELTON ARE HOOKING UP: They say when you work together you tend to get together -- if you know what I mean and I think you do.
According to "Life & Style," the pair fell for each other when they started doing "The Voice" about a year ago. That attraction has now turned into a purported romance ... one that the tabloid's anonymous on-set source says they've been "trying to keep it on the down-low."
But apparently that's not happening because the two can't keep their hands off each other. "They're all over each other," continues the source. "The chemistry between them is off the charts."
Blake's ex, Miranda Lambert, somehow already found out about it, and according to another insider, she's "really upset. She used to consider Gwen a friend."
So far, there's been no denial from Gwen or Blake.