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Watch Miley Cyrus Watch Britney Spears Lip Sync in Vegas (Video)

Katy Perry also watches Speaks kick off residency at Planet Hollywood

The start of Britney Spears‘ two-year residency at Las Vegas’ Planet Hollywood brought jokes about her lip-syncing, praise for her choreography, and sheer joy to Miley Cyrus, who rocked out in the front row.

As Yahoo Music noted, fans’ consensus seemed to be that Spears lip-synced without apology, but that fans didn’t want one: They knew what to expect. Spears “Piece of Me” show got high marks for Vegas-worthy dance routines for hits like “3,” “Scream & Shout,” and “Toxic.” The singing wasn’t all that was fake: “Toxic” featured faux toxic rain.

Also read: Inside Britney Spears’ Miley Cyrus and Katy Perry-Approved Vegas Show

The ex-“X Factor” judge’s influence on modern pop was obvious from her guest list. Along with Cyrus — who namechecked Spears in her hit “Party in the U.S.A.” — Katy Perry and Adam Lambert also attended.

If fans liked Spears, she liked them too: “Wow… perfect audience for the 1st #PieceOfMe show! That was AMAZING! I <3 you Vegas!!!” she tweeted, along with the picture above.

Also read: Britney Spears Suffers Worst Album Debut Ever With ‘Britney Jean’

And she had special messages for Cyrus and Perry.

Was SOOOO good to see you again girl!,” she tweeted to Perry. “Glad we could make our Vegas date happen :)”

Also read: Britney Spears Talks Sex in E! Doc ‘I Am Britney Jean,’ Reveals Full Las Vegas Residency Set List

She tweeted to Cyrus: “Love you so much! Thank you for coming to #PieceofMe! I adore you :)”

Watch Cyrus dance to Spears: