I saw it last night. It was brightest object in sky..............
Jupiter is about halfway across the sky to the west from the other two and is bright white. It's a wee bit brighter than Mars at this time (minus 1.8 vs minus 1.9). Saturn is to the east of Mars and not nearly as bright. It's also yellowish.
Source: Sky & Telescope Magazine:
http://www.skyandtelescope.com/observing/sky-at-a-glance/this-weeks-sky-at-a-glance-may-27-june-4/