Pop star Madonna said it was a shame the United States could put a black man in the White House but not allow same-sex marriage, rocking on her world tour with guests Justin Timberlake and Britney Spears.
Voters approved a proposal in Tuesday's presidential elections which amended the California's constitution to say that only marriages between men and women are recognized in the state.
The decision came only six months after California's Supreme Court overturned a previous ban on same-sex marriage, paving the way for thousands of gay and lesbian couples to tie the knot in the state.
"If we can elect an African-American as president, we can support gay marriage!," Madonna shouted to 30,000 fans at Dodger Stadium late Thursday, referring to president-elect Barack Obama. "Defeat Prop 8! We will not give up!.
"I am sorry we did not win Proposition 8. If we can have an African-American in the White House, we can have gay marriage," insisted the 50-year-old pop star who is divorcing her husband British director Guy Ritchie.
Spears joined Madonna to sing the last verse of "Human Nature." Capping the fleeting duet, Madonna shouted: "I'm not your bitch!" then pointed to Spears, adding: "She's not your bitch."
Later Madonna danced and sang her duet with Spears' ex Timberlake, "4 Minutes," as stars such as singer Fergie, Drew Barrymore, Ryan Seacrest and Jennifer Lopez enjoyed the show. To check out shots from the show - visit our photo galleries.
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