The Lakers were down 3-2 when Aguilera sang before Tuesday's game at the Staples Center.
Meanwhile, police and city officials say they have a plan in place for Thursday's game to stop any would-be troublemakers. L.A. Mayor Antonio Villaraigosa is encouraging Angelenos to stay home if they can.
"If you don't have a ticket for Game 7, we encourage you to enjoy this time with family and friends," said Villaraigosa. "Save money, save gas, by celebrating at or near your home."
Program schedule for ABC7 Thursday night:
- 4 p.m.: Eyewitness News
- 5 p.m.: Eyewitness News
- 5:30 p.m.: GMC NBA Countdown
- 6 p.m.: 2010 NBA Finals, Game 7
- 8:30 p.m.: Sports Zone
- 9:30 p.m.: Jimmy Kimmel Live
- 10 p.m.: Jeopardy!
- 10:30 p.m.: Wheel of Fortune
- 11 p.m.: Eyewitness News
- 11:35 p.m.: Jimmy Kimmel Live
The Associated Press contributed to this report.