Victoria Beckham, Anna Faris and Felicity Huffman joined the actress and philanthropist for the Walk of Fame ceremony on Monday.
Speaking at the event, Longoria, 43, recounted how she moved to the city 20 years ago and dreamed of one day having a star.
"I feel like I'm still a little girl from Corpus Christi, Texas, who had a really big dream," a heavily pregnant Longoria said.
"I just want to say as a woman and a Latina I represent a lot of communities and I want to tell all those communities that this isn't my star this is our star."
Faris said she instantly recognised Longoria as a "force of nature" when they met on the set of Overboard last year.
She also paid tribute to Longoria as an "inspiration" as a producer and an entrepreneur, adding: "Anything you set your mind to, you accomplish."
Desperate Housewives' co-star Huffman said: "She is kind to everyone and she is hopeful for the world.
"And in these times when cynicism is confused with wisdom, clarity and reason, Eva stands with her feet firmly planted in courage faith and compassion.
"Eva provides the light for so many of us - she actually is the light."
Martin said the greatest attribute of the "incredible woman" is her kindness and work off camera.
Among her activism, Longoria was one of the leading Hollywood women to launch the Time's Up initiative in the wake of the Harvey Weinstein scandal.
The anti-sexual harassment and assault initiative aims to tackle inequality in all workplaces and has a defence fund for women to fund legal battles.
Other stars to attend the revealing of the 2,634th star on the Hollywood Walk of Fame were Melanie Griffith and William H Macy.
Additional reporting from the Press Association.