Madonna Is 'Feeling Strong' and Back in Rehearsals for Her 'Most Ambitious Tour Ever'

The Queen of Pop is ready to reign again.

After being hospitalized in late June for a "serious bacterial infection," Madonna is back at work and gearing up for the launch of her Celebration Tour, a source tells PEOPLE exclusively.

"She returned to rehearsals last Monday. She's so happy to be back onstage and is feeling strong. She's working closely with her longtime collaborators, Jamie King and Stuart Price, to put the final touches on the show," says the source, adding that the run of shows is the icon's "most ambitious tour ever."

Late last month Madonna shared photos from a vacation to Lisbon, where she spent some downtime with loved ones before heading back for rehearsals.

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