1. The gopis know that Krsna is Vamana

    O mother earth, what austerity did you perform to attain the touch of Lord Kesava's lotus feet, which has brought you such great joy that your bodily hairs are standing on end? You appear very beautiful in this condition. Was it during the Lord's current appearance that you acquired this ecstatic symptom, or was it perhaps much earlier, when He stepped upon you in His form of the dwarf Vamanadeva, or even earlier, when He embraced you in His form of the boar Varahadeva?

    Ref. VedaBase => SB 10.30.10, spoken by the Vraja-gopis