Television host and model Chrissy Teigen was accompanied by her six-week-old son, Miles Theodore Stephens, to the 'Families Belong Together' march.
The 32-year-old, who was also accompanied by husband John Legend, delivered a speech at the protest march held against United States President Donald Trump's immigration policies, holding her baby in her arms.
Teigen took to Instagram to share a picture from the rally, captioned "baby's first rally. #keepfamiliestogether"
In her speech, Teigen, acknowledging herself as the "daughter of an immigrant", explained how the US' diversity was its biggest boon.
"America at its best is big, beautiful and diverse, like our great city of Los Angeles. Can you imagine this city without the contributions of immigrants? How bland, how flavourless LA would be, how boring. Too many people demonise immigrants like they're stealing something from the people born here. Immigrants don't come here to take from us, they add to what makes America special," People magazine quoted her, as saying.
Teigen also went on to criticise the President Trump-led administration for the "cruelty" meted out at immigrants in the country, and added that she and singer husband would continue to speak up against this.
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The model was also seen mimicking President Trump at her rally speech, which she later shared on Instagram.
"my Donald impression made it to CNN. please add to my wiki," her post read.
People from all walks of life across the US took to the streets in large numbers to protest against Trump's immigration policies and family separations on Saturday.
The epicentre of the demonstration was Lafayette Square, near the White House in Washington D.C., where scores of citizens demanded immediate reunification of migrant families and the end of family separations and detentions.
The demonstrators wore white clothes as a sign of 'unity' and chanted anti-Trump slogans, such as "Shame" and carried banners which read - "Deport Trump, Reunite Families" and "asylum seekers are not criminals," CNN reported.
The protesters urged the administration to withdraw the "Zero Tolerance Policy" and end separation and detention of migrant families.