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Gravitational lensing is an important prediction of general relativity,providing both its test and a tool to detect faint but amplified sources and tomeasure masses of lenses. For some applications (e.g. testing the theory), apoint source lensed by a point-like lens would be more advantageous. However,until now only one gravitationally lensed star has been resolved. The futuretelescopes will resolve very small lensing signatures for stars orbiting thesupermassive black hole (SMBH) in the center of the Milky Way. The lensingsignatures should however be easier to detect for background stars. We predictthat ELT, TMT, and GMT will resolve the lensed images of around 100 (60) starsin the disk and 30 (20) stars in the bulge in the background of the SMBH, downto 28 (27) mag (Vega) limits at K-band, requiring 5 (1) hr of integration. Inorder to detect several such stars one needs the limit of at least 24 mag. Witha decade-long monitoring one can also detect the rotation of the lensed images.The detection of elongated images will not be possible, because this wouldrequire a nearly perfect source-lens alignment. JWST will likely be limited bythe confusion caused by stars near the Galactic center. The detection of suchlensed images will provide a very clean test of general relativity, whencombined with the SMBH mass measurement from orbital motions of stars, andaccurate measurements of the SMBH properties, because both the source and thelens can be considered point-like.

Stars lensed by the supermassive black hole in the center of the Milky Way: predictions for ELT, TMT, GMT, and JWST