Katy Perry and John Mayer are'definitely back together'

These two are beginning to upset me really good. Whats with them?

The on-off-on-off pair held hands cuddling up to each other as they attended Allison Williams' wedding on Saturday. Although they arrived separately, they were clearly each other's plus one at the lavish Wyoming ceremony. The only time the singers disentangled themselves from each other was to serenade the Girls star and her new groom, as they individually performed.

Katy wore a long petal patterned gown, while John looked slick in a suit, shirt and tie. A source at the wedding told People.com that they were 'definitely back together'.
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