[AdmSmith]

The following image shows the deflection of light rays (photons) that pass close to a spherical mass.

http://www.einstein-online.info/spotlights/light_deflection.html

[Lazamataz]

Yes, photons interact with gravity. However, if they had ANY mass, they could never reach the speed of light.

It takes infinite energy to accelerate anything with mass to the speed of light.

[Lazamataz]

Sometimes people ask "If light has no mass how can it be deflected by the gravity of a star?". One answer is that all particles, including photons, move along geodesics in general relativity and the path they follow is independent of their mass.