Anne Hathaway had a baby exactly eight week ago -- but you'd hardly know it by looking at her.
The Alice Through the Looking Glass star gave birth to her first son, Jonathan, on March 24 and opened up about one horrible post-baby gym encounter during an appearance on Tuesday's The Ellen DeGeneres Show.
"I've been out of the house a couple of times. I've been to the gym. I went to the gym three times," she revealed. "Being a mom has changed me in a couple ways. I actually, not based on this moment but other moments, feel a lot more confident."
"You know the people who have too many muscles to be in the Avengers? That's who works out at my gym," she explained. "So, I would normally walk in and feel so intimidated. But I walk in and I'm like, 'Yeah, I work out with five-pound weights, but I pushed a baby out of my body! I feel good right now!'"
Hathaway felt even better when she caught a guy who "looked like Thor's trainer" staring at her and thought he was hitting on her -- "Nice, new mom!" she told herself. Then he told her he actually was a trainer.
"I'm expecting him to say the thing that you say when someone says that they've had a baby. Which is, 'Oh my God! You look great!' Doesn't matter if it's true," she said. "So, I say to this guy I had a baby seven weeks ago and he goes, 'Oh, trying to lose the baby weight!'"
"I just mustered up my dignity and say, 'No, it's a little bit too soon to worry about weight. I'm just trying to regain my strength,'" Hathaway concluded. "He said, 'Great' and walked away and I cried a little bit."
The 33-year-old Oscar winner looked fabulous at Monday night's premiere of Alice Through the Looking Glass in Hollywood, where she showed a bit of skin in a sexy floral dress.
"I'm wearing Christopher Kane. I've known Christopher for many years and I love him and when I think of a great English designer, I think of him," she told ET of how she decided on the frock. "He's so idiosyncratic and so talented. So, I reached out to him and said, 'Want to just let your imagination go wild?'"
Unfortunately, Anne's husband, Adam Shulman, had to stay at home with their newborn, so the premiere couldn't double as a date night -- especially with his wife in that gown.
"He knows where my heart is," she said with a laugh. "He's got nothing to worry about."
When ET recently sat down with Hathaway, she opened up more on shedding pregnancy weight and how "spectacular" of a dad Shulman is. Find out more in the video below.
Check out more from Anne Hathaway in the gallery below!
Anne Hathaway through the years
Anne Hathaway reveals the horrible post-baby gym encounter that made her cry
Cast member Anne Hathaway poses at the premiere of "Alice Through the Looking Glass" at El Capitan theatre in Hollywood, U.S., May 23, 2016. REUTERS/Mario Anzuoni
Actress Anne Hathaway arrives at the New York premiere of the new Disney film 'Atlantis: The Lost Empire' at the Ziegfeld Theater in New York City. 6/6/01 Photo by Scott Gries/Getty Images
Actress Anne Hathaway, star of Disney's "The Princess Diaries," poses in her suite at the Four Seasons Hotel in Beverly Hills, Calif., April 2, 2002. Hathaway is currently staring in the new romance film "The Other Side of The World." (AP Photo/Rene Macura)
392519 03: Actress Anne Hathaway arrives for the world premiere of 'The Princess Diaries' July 29, 2001 in Los Angeles, CA. The film opens nationwide August 3, 2001. (Photo by Frederick M. Brown/Getty Images)
NEW YORK-JULY 16: Actress Anne Hathaway arrives at the world premiere of the fifth season of Sex and the City on July 16, 2002, at the American Museum of Natural History in New York City. (Photo by Lawrence Lucier/Getty Images)
NEW YORK - DECEMBER 5: Actress Anne Hathaway attends 'The Lord Of The Rings: The Two Towers' premiere December 5, 2002 at the Ziegfeld Theater, December 5 2002 in New York City. (Photo by Matthew Peyton/Getty Images)
BEVERLY HILLS, CA - FEBRUARY 15: (from left to right) Hector Elizondo, Anne Hathaway and Julie Andrews at the 54th Annual ACE Eddie Awards on February 15, 2004 at the Beverly Hilton Hotel, in Beverly Hills, California. (Photo by Giulio Marcocchi/Getty Images)
ANAHEIM, CA - AUGUST 7: Actress Anne Hathaway arrives at The Princess Diaries 2: Royal Engagement Premiere held at Downtown Disneyland e on August 7, 2004 in Anaheim, California. (Photo by Frazer Harrison/Getty Images)
UNIVERSAL CITY, CA - AUGUST 8: Singer Nick Lachey and actress Anne Hathaway speak on stage at The 2004 Teen Choice Awards held on August 8, 2004 at Universal Amphitheater, in Universal City, California. (Photo by Kevin Winter/Getty Images)
NEW YORK - AUGUST 10: (U.S. TABLOIDS OUT) Actress Anne Hathaway makes an appearance on MTV's Total Request Live on August 10, 2004 in New York City. (Photo by Peter Kramer/Getty Images)
NEW YORK - OCTOBER 13: Actress Anne Hathaway attends the 9th Annual National Awards Dinner hosted by the Americans For The Arts at Cipriani's 42nd Street October 13, 2004 in New York City. (Photo by Evan Agostini/Getty Images)
MUNICH, GERMANY: British actress Julie Andrews (R) and US actress Anne Hathaway pose during a photocall in Munich, 22 September 2004. Andrews and Hathaway are in Germany to promote their new film 'Princess Diaries 2: The Royal Engagement'. AFP PHOTO DDP/TIMM SCHAMBERGER (Photo credit should read TIMM SCHAMBERGER/AFP/Getty Images)
NEW YORK - DECEMBER 6: Actress Anne Hathaway attends a preview gala dinner for the Metropolitan Museum's 'Wild: Fashion Untamed' exhibition, hosted by fashion designer Robert Cavalli, on December 6, 2004 at the Metropolitan Museum of Art, in New York City. (Photo by Evan Agostini/Getty Images)
NEW YORK - JUNE 05: Actress Anne Hathaway and her boyfriend Raffaello Follieri attend the after party for the 59th Annual Tony Awards at the Marriott Marquis June 5, 2005 in New York City. (Photo by Peter Kramer/Getty Images)
NEW YORK - APRIL 25: Honoree actress Anne Hathaway gives a speech at The Barrow Group's 11th Annual Celebrity Scribbles and Doodle's Auction sponsored by Gran Centenario Tequilla on April 25, 2005 in New York City. (Photo by Scott Wintrow/Getty Images)
TORONTO - SEPTEMBER 10: Actress Anne Hathaway poses for a portrait while promoting his film 'Brokeback Mountain' at the Toronto International Film Festival September 10, 2005 in Toronto, Canada. (Photo by Carlo Allegri/Getty Images)
NEW YORK - DECEMBER 3: Actresses Glenn Close (L) and Anne Hathaway (R) attend the Premiere Of 'Hoodwinked' on December 3, 2005 in New York City. (Photo by Andrew H. Walker/Getty Images)
NEW YORK - JUNE 19: Actress Anne Hathaway attends the 20th Century Fox premiere of The Devil Wears Prada at the Loews Lincoln Center Theatre on June 19, 2006 in New York City. (Photo by Evan Agostini/Getty Images)
NEW YORK - JUNE 29: (U.S. TABLOIDS OUT) Actress Anne Hathaway makes an appearance on MTV's Total Request Live at MTV Studios Times Square June 29, 2006 in New York City. (Photo by Evan Agostini/Getty Images)
DEAUVILLE, FRANCE - SEPTEMBER 09: Actress Anne Hathaway poses at the photocall for The Devil Wears Prada at the 32nd Deauville Festival Of American Film on September 9, 2006 in Deauville, France. (Photo by Dean Mouhtaropoulos/Getty Images)
Venice, ITALY: US actress Anne Hathaway arrives before the screening of 'The Devil Wears Prada' at the Lido of Venice, 07 September 2006, during the 63rd Venice International Film Festival. 'The Devil Wears Prada' directed by US David Frankel is presented out of competition. AFP PHOTO / FILIPPO MONTEFORTE (Photo credit should read FILIPPO MONTEFORTE/AFP/Getty Images)
DEAUVILLE, FRANCE - SEPTEMBER 09: Actresses Meryl Streep (L) and Anne Hathaway arrive at the The Devil Wears Prada premiere at the 32nd Deauville Festival Of American Film on September 9, 2006 in Deauville, France. (Photo by Francois Durand/Getty Images)
NEW YORK - OCTOBER 26: Actress Anne Hathaway and boyfriend Raffaello Follieri attend The Fashion Group International's 23rd Annual Night of Stars at Cipriani October 26, 2006 in New York City. (Photo by Evan Agostini/Getty Images)
NEW YORK - OCTOBER 25: Actress Anne Hathaway arrives to celebrate Marchesa's second anniversary at Bergdorf Goodman October 25, 2006 in New York City. (Photo by Evan Agostini/Getty Images)
NEW YORK - NOVEMBER 09: Actress Anne Hathaway attends 'The Black Ball' presented by Conde Nast Media Group and hosted by Alicia Keys and Iman to benefit 'Keep A Child Alive' at Hammerstein Ballroom November 9, 2006 in New York City. (Photo by Peter Kramer/Getty Images)
Hollywood, UNITED STATES: Anne Hathaway arrives on the red carpet for the 79th Annual Academy Awards in Hollywood, California, 25 February 2007. AFP PHOTO / Hector MATA (Photo credit should read HECTOR MATA/AFP/Getty Images)
NEW YORK - JULY 31: (U.S. TABS OUT) Actress Anne Hathaway poses for a photo backstage during MTV's Total Request Live at the MTV Times Square Studios on July 31, 2007 in New York City. (Photo by Scott Gries/Getty Images)
NEW YORK - NOVEMBER 12: Actress Anne Hathaway attends The Christopher & Dana Reeve Foundation's 'A Magical Evening' Gala at the Marriot Marquis Harlem Room on November 12, 2007 in New York City. (Photo by Scott Wintrow/Getty Images)
Presenters Steve Carell (L) and actress Anne Hathaway (R) pose with writer/director Brad Bird, winner of the Best Animated Feature Film Of The Year award for 'Ratatouille' in the press room during the 80th Annual Academy Awards held at the Kodak Theatre on February 24, 2008 in Hollywood, California. (Photo by Vince Bucci/Getty Images)
CULVER CITY, CA - MAY 30: Actress Anne Hathaway presents the award for 'Funniest M.F.' onstage during the taping of Spike TV's 2nd Annual 'Guys Choice' Awards held at Sony Studios on May 30, 2008 in Culver City, California. The show airs on June 22, 2008 at 10PM ET/PT on Spike TV. (Photo by Alberto E. Rodriguez/Getty Images)
VENICE, ITALY - SEPTEMBER 03: Actress Anne Hathaway attends the 'Rachel Getting Married' premiere at the Sala Grande during the 65th Venice Film Festival on September 3, 2008 in Venice, Italy. (Photo by Pascal Le Segretain/Getty Images)
BEVERLY HILLS, CA - APRIL 02: Actress Anne Hathaway and fashion designer Valentino at the Rodeo Drive Walk of Style Induction Ceremony for Valentino in Beverly Hills, Calif. on Thursday, April 2, 2009.. (Photo by Jason Merritt/Getty Images)
NEW YORK - JUNE 25: Actors Audra McDonald, Raul Esparza, Anne Hathaway, David Pittu and Jay O. Sanders perform during the 2009 Shakespeare in the Park opening night performance of 'Twelfth Night at the Delacorte Theater on June 25, 2009 in New York City. (Photo by Michael Loccisano/Getty Images)
Actress Anne Hathaway arrives at the 'Valentine's Day' Los Angeles Premiere at the Grauman's Chinese Theatre in Hollywood, California on February 8, 2010. AFP PHOTO / GABRIEL BOUYS (Photo credit should read GABRIEL BOUYS/AFP/Getty Images)
Actress Anne Hathaway arrives on the red carpet for the premiere of her movie 'Love & Other Drugs' which is showing as part of the AFI Film Festival at Grauman's Chinese Theatre in Hollywood on November 4, 2010. AFP PHOTO/Mark RALSTON (Photo credit should read MARK RALSTON/AFP/Getty Images)
US actress Anne Hathaway hosts the Nobel Peace Prize concert in Oslo on December 11, 2010. Artists from all over the world gathered at the Oslo Spektrum to help spread the message of peace and celebrate this year's Nobel Peace Prize laureate and dissident Liu Xiaobo. AFP PHOTO/ODD ANDERSEN (Photo credit should read ODD ANDERSEN/AFP/Getty Images)
CRESPIERES, FRANCE - JULY 06: Anne Hathaway attends 'The White Fairy Tale Love Ball' in support Of 'The Naked Heart Foundation' at Chateau de Wideville on July 6, 2011 in Crespieres, France. (Photo by Pascal Le Segretain/Getty Images)
NEW YORK, NY - NOVEMBER 01: Anne Hathaway speaks at the Princess Grace Awards Gala at Cipriani 42nd Street on November 1, 2011 in New York City. (Photo by Stephen Lovekin/Getty Images for Princess Grace Foundation)
NEW YORK, NY - JUNE 11: Actress Anne Hathaway attends the Stella McCartney Resort 2013 Presentation on June 11, 2012 in New York City. (Photo by Andrew H. Walker/Getty Images)
HOLLYWOOD, CA - DECEMBER 13: Actress Anne Hathaway attends the Hugh Jackman Hollywood Walk Of Fame ceremony on December 13, 2012 in Hollywood, California. (Photo by Jason Merritt/Getty Images)
HOLLYWOOD, CA - FEBRUARY 24: Actress Anne Hathaway, winner of the Best Supporting Actress award for 'Les Miserables,' poses in the press room during the Oscars held at Loews Hollywood Hotel on February 24, 2013 in Hollywood, California. (Photo by Jason Merritt/Getty Images)
SANTA MONICA, CA - OCTOBER 19: Actress Anne Hathaway attends The Pink Party 2013 at Barker Hangar on October 19, 2013 in Santa Monica, California. (Photo by Jason Kempin/Getty Images for Cedars-Sinai Women's Cancer Program)
Anne Hathaway arrives to the 2014 Vanity Fair Oscar Party on March 2, 2014 in West Hollywood, California. AFP PHOTO/ADRIAN SANCHEZ-GONZALEZ (Photo credit should read ADRIAN SANCHEZ-GONZALEZ/AFP/Getty Images)
SHANGHAI, CHINA - NOVEMBER 10: Actress Anne Hathaway attends director Christopher Nolan's film 'Interstellar' premiere press conference at the Peninsula Shanghai on November 10, 2014 in Shanghai, China. (Photo by ChinaFotoPress/Getty Images)
Anne Hathaway arrives at the 2015 Metropolitan Museum of Art's Costume Institute Gala benefit in honor of the museums latest exhibit China: Through the Looking Glass May 4, 2015 in New York. AFP PHOTO / TIMOTHY A. CLARY (Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images)
NEW YORK, NY - JUNE 15: Actress Anne Hathaway attends 'A Midsummer Night's Dream' New York premiere at DGA Theater on June 15, 2015 in New York City. (Photo by Noam Galai/WireImage)
LOS ANGELES, CA - JANUARY 27: Actress Anne Hathaway arrives at the LA Art Show and Los Angeles Fine Art Show's 2016 Opening Night Premiere Party benefiting St. Jude Children's Research Hospital at the Los Angeles Convention Center on January 27, 2016 in Los Angeles, California. (Photo by Amanda Edwards/WireImage)