The 'Mean Girls' star finished a court-ordered stint this July and in an interview to Oprah Winfrey promised to stay sober but she sparked fears of relapse after she was seen partying with British boyband The Wanted in California.
Bandmember George, who is said to have had a fling with Lohan, said he had invited the actress for the party, reported The Daily Star.
"We called her to make sure she was Ok and she ended up coming to the show in Los Angeles. She's off the booze and doing great," George said.
