Maria Shriver & Bono Positive Vibes

5/26/2011 5:00 PM PDT

Maria Shriver & Bono -- Positive Vibes

Maria Shriver found the perfect counterbalance to all the negative in her life -- a lunch date with rock music's super do-gooder Bono.

Maria and the U2 front man weren't hiding from cameras either ... since they chose to lunch at The Ivy -- a known paparazzi hangout.

No word on what brought Bono and Maria together -- they both back numerous charities -- but we can say that, for a change ... Maria was smiling.

Nice work, Bono.