Kate Winslet's tearful reaction to Leonardo DiCaprio's Oscar win will give you all the feels

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Kate Winslet Adorably Tears Up During Leonardo DiCaprio's Oscars Speech

Kate Winslet and Leonardo DiCaprio's friendship was in full force on Sunday night when The Revenant star hit the stage to accept his very first Oscar award.

Winslet -- who was also nominated for her role in Steve Jobs but lost out to The Danish Girl's Alicia Vikander -- told ET earlier this month that she had Leo's back at the Academy Awards, and she stuck to that promise.

WATCH: Leonardo DiCaprio Is Not Amused By Revenant Bear Joke at the Oscars

When DiCaprio finally won for Best Actor after being nominated five times prior, his Titanic co-star couldn't hold back her tears of joy. Cameras cut to the 40-year-old actress and her husband, Ned Rocknroll, looking proudly at the 41-year-old actor on stage (about 2:23 minutes into speech). "To my friends, I love you dearly. You know who you are," DiCaprio said.

While the actor didn't mention Winslet directly, he did use his win as a platform to speak about a cause close to his heart, the environment. "Making The Revenant was about man's relationship to the natural world," he declared. "Climate change is real, it is the most urgent threat facing our species."

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Kate Winslet's tearful reaction to Leonardo DiCaprio's Oscar win will give you all the feels
Host Chris Rock speaks at the Oscars on Sunday, Feb. 28, 2016, at the Dolby Theatre in Los Angeles. (Photo by Chris Pizzello/Invision/AP)
Brie Larson, from left, Cate Blanchett, and Kate Winslet appear in the audience at the Oscars on Sunday, Feb. 28, 2016, at the Dolby Theatre in Los Angeles. (Photo by Chris Pizzello/Invision/AP)
Emily Blunt, left, and Charlize Theron present the award for best original screenplay at the Oscars on Sunday, Feb. 28, 2016, at the Dolby Theatre in Los Angeles. (Photo by Chris Pizzello/Invision/AP)
Actor Ryan Gosling (L) and Actor Russell Crowe present on stage at the 88th Oscars on February 28, 2016 in Hollywood, California. AFP PHOTO / MARK RALSTON / AFP / MARK RALSTON (Photo credit should read MARK RALSTON/AFP/Getty Images)
Charles Randolph (L) and Adam McKay accep their awards for Best Adapted Screenplay, The Big Short on stage at the 88th Oscars on February 28, 2016 in Hollywood, California. AFP PHOTO / MARK RALSTON / AFP / MARK RALSTON (Photo credit should read MARK RALSTON/AFP/Getty Images)
Christian Bale, left, congratulates Adam McKay as he walks on stage to accept the award for best adapted screenplay for âThe Big Shortâ at the Oscars on Sunday, Feb. 28, 2016, at the Dolby Theatre in Los Angeles. (Photo by Chris Pizzello/Invision/AP)
Sarah Silverman speaks at the Oscars on Sunday, Feb. 28, 2016, at the Dolby Theatre in Los Angeles. (Photo by Chris Pizzello/Invision/AP)
HOLLYWOOD, CA - FEBRUARY 28: David White (L) and Mark A. Mangini win the Best Sound Editing award for 'Mad Max: Fury Road' onstage during the 88th Annual Academy Awards at the Dolby Theatre on February 28, 2016 in Hollywood, California. (Photo by Kevin Winter/Getty Images)
Members of Ex-Machina visual effects team accept their award for visual effects on stage at the 88th Oscars on February 28, 2016 in Hollywood, California. AFP PHOTO / MARK RALSTON / AFP / MARK RALSTON (Photo credit should read MARK RALSTON/AFP/Getty Images)
THE OSCARS(r) - THEATRE - The 88th Oscars, held on Sunday, February 28, at the Dolby Theatre(r) at Hollywood & Highland Center(r) in Hollywood, are televised live by the ABC Television Network at 7 p.m. EST/4 p.m. PST. (Photo by Adam Taylor/ABC via Getty Images) CATE BLANCHETT
HOLLYWOOD, CA - FEBRUARY 28: Mark A. Mangini (L) and David White accept the Best Sound Editing award for 'Mad Max: Fury Road' onstage during the 88th Annual Academy Awards at the Dolby Theatre on February 28, 2016 in Hollywood, California. (Photo by Kevin Winter/Getty Images)
Chadwick Boseman, left, and Chris Evans present the award for best sound editing at the Oscars on Sunday, Feb. 28, 2016, at the Dolby Theatre in Los Angeles. (Photo by Chris Pizzello/Invision/AP)
Priyanka Chopra, left, and Liev Schreiber present the award for best film editing at the Oscars on Sunday, Feb. 28, 2016, at the Dolby Theatre in Los Angeles. (Photo by Chris Pizzello/Invision/AP)
Rachel McAdams, left, and Michael B. Jordan present the award for best cinematography at the Oscars on Sunday, Feb. 28, 2016, at the Dolby Theatre in Los Angeles. (Photo by Chris Pizzello/Invision/AP)
Elka Wardega, from left, Lesley Vanderwalt, and Damian Martin accept the award for best makeup and hairstyling for âMad Max: Fury Roadâ at the Oscars on Sunday, Feb. 28, 2016, at the Dolby Theatre in Los Angeles. (Photo by Chris Pizzello/Invision/AP)
Alicia Vikander accepts the award for best actress in a supporting role for âThe Danish Girlâ at the Oscars on Sunday, Feb. 28, 2016, at the Dolby Theatre in Los Angeles. (Photo by Chris Pizzello/Invision/AP)
Tina Fey, left, and Steve Carell present the award for best production design at the Oscars on Sunday, Feb. 28, 2016, at the Dolby Theatre in Los Angeles. (Photo by Chris Pizzello/Invision/AP)
Cate Blanchett presents the award for best costume design at the Oscars on Sunday, Feb. 28, 2016, at the Dolby Theatre in Los Angeles. (Photo by Chris Pizzello/Invision/AP)
J.K. Simmons, right, presents Alicia Vikander with the award for best actress in a supporting role for âThe Danish Girlâ at the Oscars on Sunday, Feb. 28, 2016, at the Dolby Theatre in Los Angeles. (Photo by Chris Pizzello/Invision/AP)
Maria Fahl Vikander, left, congratulates Alicia Vikander after she won the award for best actress in a supporting role for âThe Danish Girlâ at the Oscars on Sunday, Feb. 28, 2016, at the Dolby Theatre in Los Angeles. (Photo by Chris Pizzello/Invision/AP)
Kerry Washington, left, and Henry Cavill speak at the Oscars on Sunday, Feb. 28, 2016, at the Dolby Theatre in Los Angeles. (Photo by Chris Pizzello/Invision/AP)
Charlize Theron, left, and Cate Blanchett appear in the audience at the Oscars on Sunday, Feb. 28, 2016, at the Dolby Theatre in Los Angeles. (Photo by Chris Pizzello/Invision/AP)
Jason Segel, left, and Olivia Munn speak at the Oscars on Sunday, Feb. 28, 2016, at the Dolby Theatre in Los Angeles. (Photo by Chris Pizzello/Invision/AP)
Droid characters from "Star Wars", BB-8, from left, R2-D2, and C-3PO speak at the Oscars on Sunday, Feb. 28, 2016, at the Dolby Theatre in Los Angeles. (Photo by Chris Pizzello/Invision/AP)
Maria Fahl Vikander, from left, Harvey Weinstein, and Lady Gaga appear in the audience at the Oscars on Sunday, Feb. 28, 2016, at the Dolby Theatre in Los Angeles. (Photo by Chris Pizzello/Invision/AP)
Margot Robbie, left, and Jared Leto present the award for best makeup and hairstyling at the Oscars on Sunday, Feb. 28, 2016, at the Dolby Theatre in Los Angeles. (Photo by Chris Pizzello/Invision/AP)
Jenny Beavan accepts the award for best costume design for âMad Max: Fury Roadâ at the Oscars on Sunday, Feb. 28, 2016, at the Dolby Theatre in Los Angeles. (Photo by Chris Pizzello/Invision/AP)
WEST HOLLYWOOD, CA - FEBRUARY 28: Musicians Verdine White (L) and Philip Bailey (R) of Earth, Wind & Fire and Beck attend the 24th Annual Elton John AIDS Foundation's Oscar Viewing Party at The City of West Hollywood Park on February 28, 2016 in West Hollywood, California. (Photo by Michael Kovac/Getty Images for EJAF)
HOLLYWOOD, CA - FEBRUARY 28: Actors Daisy Ridley (L) and Dev Patel speak onstage during the 88th Annual Academy Awards at the Dolby Theatre on February 28, 2016 in Hollywood, California. (Photo by Kevin Winter/Getty Images)
Director Asif Kapadia (L) and James Gay-Rees (R) accept the award for Best Documentary Feature, Amy, on stage at the 88th Oscars on February 28, 2016 in Hollywood, California. AFP PHOTO / MARK RALSTON / AFP / MARK RALSTON (Photo credit should read MARK RALSTON/AFP/Getty Images)
HOLLYWOOD, CA - FEBRUARY 28: (EDITORS NOTE: Image has been converted to black and white.) Actor Leonardo DiCaprio attends the 88th Annual Academy Awards at Hollywood & Highland Center on February 28, 2016 in Hollywood, California. (Photo by Mike Windle/Getty Images)
Louis C.K., left, presents Sharmeen Obaid-Chinoy with the award for best documentary short for âA Girl in the River: The Price of Forgivenessâ at the Oscars on Sunday, Feb. 28, 2016, at the Dolby Theatre in Los Angeles. (Photo by Chris Pizzello/Invision/AP)
Steven Spielberg, left, congratulates Mark Rylance after he won the award for best actor in a supporting role for âBridge of Spiesâ at the Oscars on Sunday, Feb. 28, 2016, at the Dolby Theatre in Los Angeles. (Photo by Chris Pizzello/Invision/AP)
The Weeknd performs his nominated song "Earned It" at the Oscars on Sunday, Feb. 28, 2016, at the Dolby Theatre in Los Angeles. (Photo by Chris Pizzello/Invision/AP)
HOLLYWOOD, CA - FEBRUARY 28: (EDITORS NOTE: Image has been converted to black and white.) Actress Rachel McAdams (C) attends the 88th Annual Academy Awards at Hollywood & Highland Center on February 28, 2016 in Hollywood, California. (Photo by Mike Windle/Getty Images)
HOLLYWOOD, CA - FEBRUARY 28: Musician Dave Grohl performs onstage during the 88th Annual Academy Awards at the Dolby Theatre on February 28, 2016 in Hollywood, California. (Photo by Kevin Winter/Getty Images)
HOLLYWOOD, CA - FEBRUARY 28: Academy of Motion Picture Arts and Sciences President Cheryl Boone Isaacs speaks onstage during the 88th Annual Academy Awards at the Dolby Theatre on February 28, 2016 in Hollywood, California. (Photo by Kevin Winter/Getty Images)
Children participate in a skit at the Oscars on Sunday, Feb. 28, 2016, at the Dolby Theatre in Los Angeles. (Photo by Chris Pizzello/Invision/AP)
Mark Rylance accepts the award for best actor in a supporting role for âBridge of Spiesâ at the Oscars on Sunday, Feb. 28, 2016, at the Dolby Theatre in Los Angeles. (Photo by Chris Pizzello/Invision/AP)
Naji Abu Nowar, from left, Jacir Eid, and Hassan Mutlag Al-Maraiyeh arrive at the Oscars on Sunday, Feb. 28, 2016, at the Dolby Theatre in Los Angeles. (Photo by Richard Shotwell/Invision/AP)
Actor Jacob Tremblay (L) and Actor Abraham Attah present on stage at the 88th Oscars on February 28, 2016 in Hollywood, California. AFP PHOTO / MARK RALSTON / AFP / MARK RALSTON (Photo credit should read MARK RALSTON/AFP/Getty Images)
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WATCH: Adele Wishes Oscar Nominee Leonardo DiCaprio 'Good Luck' From Steps of the Titanic!

The actor ended his speech on a thought provoking note, adding, "Let us not take this planet for granted. I do not take tonight for granted."

DiCaprio brought his mother, Irmelin Indenbirken, to the awards show, but on the red carpet, Winslet was his date! In addition to sweetly posing outside the event to the delight of Titanic fans everywhere, the famous friends were also super loving to one another inside the Oscars. The two were snapped hugging, exchanging sweet kisses on the cheek and holding hands.

WATCH: Kate Winslet Adorably Admits Rose Left Jack to Die in Titanic

Ahead of the Academy Awards, Winslet -- who won an Oscar for The Reader in 2009 with DiCaprio in the audience -- told ET that she was thrilled to see how many fans were in support of her longtime pal winning on Sunday night. "The sense of good will behind Leo is the thing that's touching me the most," she exclaimed. "I mean, literally, people in the street go, 'Hey Kate, you know it's Leo's year,' and I'm like, 'Hip, yeah! I think it really might be!'"

Kate Winslet Finally Admits That Jack Could've Lived in 'Titanic'
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