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We present a suite of observations of the recently identified ultraluminousBAL quasar APM 08279+5255, taken both in the infra-red with the NICMOS highresolution camera on board the Hubble Space Telescope, and at 3.5cm with theVery Large Array. With an inferred luminosity of ~5x10^15 Solar luminosities,APM 08279+5255 is apparently the most luminous system known. Extantground-based images show that APM 08279+5255 is not point-like, but is insteadseparated into two components, indicative of gravitational lensing. The muchhigher resolution images presented here also reveal two point sources, A and B,of almost equal brightness (f_B/f_A=0.782 +/- 0.010), separated by 0."378 +/-0."001, as well as a third, previously unknown, fainter image, C, seen betweenthe brighter images. While the nature of C is not fully determined, severallines of evidence point to it being a third gravitationally lensed image of thequasar, rather than being the lensing galaxy. Simple models which recover therelative image configuration and brightnesses are presented. While proving tobe substantially amplified, APM 08279+5255 possesses an intrinsic bolometricluminosity of ~10^14 to 10^15 Solar luminosities and remains amongst the mostluminous objects known.Comment: 21 pages, 5 figures (2 as GIF files); accepted for publication in the  Astronomical Journa

NICMOS and VLA Observations of the Gravitationally Lensed Ultraluminous BAL Quasar APM 08279+5255: Detection of a Third Image