LOS ANGELES — Some of Hollywood's most famous stars are getting facelifts before the Academy Awards.

Workers have been fixing broken sidewalk stars and cracked terrazzo on the Hollywood Walk of Fame in front of the Kodak Theatre, where the glitzy Oscar ceremony will be held Feb. 25.

"We wanted it to look good for the Academy Awards," said Hollywood honorary mayor Johnny Grant, who leads the Hollywood Historic Trust that operates the Walk of Fame.

Hollywood officials believe the buckling was caused by a Metro subway line, which has a station beneath the Hollywood & Highland center that houses the theater. Transportation officials say it's the sun, suggesting damaging "thermo-expansion" occurs when sunlight heats the black terrazzo.

The $80,000 in repair work is viewed as a test project that could also determine the true cause of the buckling. The city has been investigating the problem since 2002.

About 121 damaged terrazzo squares, plus 16 others with stars in them, are being replaced. The walk has more than 2,320 stars.