Rose, 32, donned a floral dress and sneakers and had a huge smile on her face as she took in the performances with friends and sister Portia.
The actress watched the Mumford & Sons set with pal Carey Mulligan and appeared happy and carefree, despite her husband's recent struggles.
Kit, 32, has been receiving treatment for "personal issues" at a wellness center since shortly before the Game of Thrones finale on May 19.
"Kit went to treatment for Rose. He was living a very unhealthy lifestyle. He was stressed all the time and using unhealthy coping tools," a source told Us Weekly.
The source continued, "Rose is so supportive of Kit. She loves him very much. She had been telling him to get into treatment for a little while now.”
The pair, who fell in love on the set of the hit HBO show, tied the knot in Scotland in June 2018. They will mark their first anniversary as a married couple on June 23, 2019.
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