© 2026 ABC News

She also commented on her brother's strong bond with her daughter Grace.

\"Thank you for being such a good uncle to Grace and fantastic brother to me and Chandler,\" she wrote. \"We love you and can’t wait to celebrate today!\"

Bindi and Robert's mother Terri Irwin also shared a throwback of Steve holding Robert when he was a baby.

Alongside the photo, she wrote, \"Happy birthday @RobertIrwin! I have treasured every moment of your 19 years, and I look forward to the adventures ahead.\"

\"I know your dad would be so proud of you,\" she added. \"You’re the best!\"

WATCH: Robert Irwin can't wait to show his niece his role on Disney+'s 'Bluey'

Video: Robert Irwin can't wait to show his niece his role on Disney+'s 'Bluey'

","canonicalUrl":"https://abcnews.com/GMA/Culture/bindi-irwin-late-father-steve-proud-brother-robert/story?id=94278097","legacySlug":"/culture/story/bindi-irwin-late-father-steve-proud-brother-robert-94278097","noIndexNoFollow":false},"publishTime":"17:13","publishDate":"12-01-2022","updatedTime":"17:33","updatedDate":"12-01-2022","socialImage":{"alt":"Bindi Irwin made a birthday tribute to her brother, Robert, with this image on her Instagram, Dec. 1, 2022.","credit":"Bindi Irwin/Instagram","ratio":"16x9","url":"https://s.abcnews.com/images/GMA/bindi-robert-irwin-ht-thg-221201_1669909814199_hpMain_16x9_1600.jpg","width":992,"height":558},"datePublished":"12/1/2022 17:13:29 GMT","video":{"live":false,"id":94278097,"headline":"Bindi Irwin shares loving post for brother Robert","mediaAssetTitle":"GMA BINDI IRWIN ROBERT BIRTHDAY POST","description":"The conservationist and zookeeper shared a post for her brother on his birthday.","duration":"2:00","posterImg":{"url":"https://s.abcnews.com/images/GMA/default-img-undefined.png","width":608,"height":342},"video":{"feed":"https://service-pkgabcnews.akamaized.net/opp/hls/abcnews/2021/02/210226_gma_digital_rob_irwin_bluey_,500,800,1200,1800,2500,3200,4500,.mp4.csmil/playlist.m3u8"},"playlist":["81033883","82133888","77963086"]},"relatedItems":[{"contentType":"story","date":"November 8, 2021","headline":"Bindi Irwin posts video of her daughter dipping her feet in ocean for 1st time","section":"culture","slug":"/culture/story/bindi-irwin-shares-video-daughter-dipping-feet-ocean-81033883","id":81033883,"image":{"alt":"Bindi Irwin posts video of her daughter dipping her feet in ocean for 1st time","url":"https://s.abcnews.com/images/GMA/bindi-irwin-splash-flt-ht-ps-211108_1636387314868_hpMain_4x3t_240.jpg","credit":"bindisueirwin/Instagram","ratio":"1x1"}},{"contentType":"story","date":"January 7, 2022","headline":"Bindi Irwin shares photo of her new tattoo done in her father Steve's handwriting ","section":"culture","slug":"/culture/story/bindi-irwin-shares-photo-tattoo-father-steves-handwriting-82133888","id":82133888,"image":{"alt":"Bindi Irwin shares photo of her new tattoo done in her father Steve's handwriting ","url":"https://s.abcnews.com/images/GMA/bindi-irwin-file-gty-ml-220107_1641574907822_hpMain_4x3t_240.jpg","credit":"Jc Olivera/WireImage via Getty Images, FILE","ratio":"1x1"}},{"contentType":"story","date":"May 28, 2021","headline":"Bindi Irwin shares sweet pic of daughter Grace's 1st koala encounter","section":"culture","slug":"/culture/story/bindi-irwin-shares-sweet-pic-daughter-graces-1st-77963086","id":77963086,"image":{"alt":"Bindi Irwin shares sweet pic of daughter Grace's 1st koala encounter","url":"https://s.abcnews.com/images/GMA/bindi-irwin-gty-ps-200420_hpMain_4x3t_240.jpg","credit":"Bradley Kanaris/Getty Images, FILE","ratio":"1x1"}}],"relatedContentSection":"news","schemaContent":{"name":"Bindi Irwin shares loving post for brother Robert","description":"The conservationist and zookeeper shared a post for her brother on his birthday.","duration":"2:00","uploadDate":"12-01-2022","publication":"12-01-2022","images":"https://s.abcnews.com/images/GMA/default-img-undefined.png","url":"https://service-pkgabcnews.akamaized.net/opp/hls/abcnews/2021/02/210226_gma_digital_rob_irwin_bluey_,500,800,1200,1800,2500,3200,4500,.mp4.csmil/playlist.m3u8","contentUrl":"https://service-pkgabcnews.akamaized.net/opp/hls/abcnews/2021/02/210226_gma_digital_rob_irwin_bluey_,500,800,1200,1800,2500,3200,4500,.mp4.csmil/playlist.m3u8","link":"https://www.goodmorningamerica.com/culture/story/bindi-irwin-late-father-steve-proud-brother-robert-94278097"}},"playlist":[{"id":"132628890","contentType":"story","section":"news"},{"id":"132569874","contentType":"story","section":"news"},{"id":"132567885","contentType":"story","section":"news"},{"id":"132510121","contentType":"story","section":"news"},{"id":"132473181","contentType":"story","section":"news"},{"id":"132497933","contentType":"story","section":"news"},{"id":"132281378","contentType":"story","section":"news"},{"id":"132283010","contentType":"story","section":"news"},{"id":"132273278","contentType":"story","section":"news"},{"id":"132231169","contentType":"story","section":"news"},{"id":"132206748","contentType":"story","section":"news"},{"id":"132200241","contentType":"story","section":"news"},{"id":"132054443","contentType":"story","section":"news"},{"id":"132054798","contentType":"story","section":"news"},{"id":"132033010","contentType":"story","section":"news"},{"id":"131912713","contentType":"story","section":"news"},{"id":"131830583","contentType":"story","section":"news"},{"id":"131834976","contentType":"story","section":"news"},{"id":"131554765","contentType":"story","section":"news"},{"id":"131554815","contentType":"story","section":"news"}],"kvps":{"pgtyp":"article","lang":"en","sp":"goodmorningamerica","programmatic":"true","bundleId":"com.abcnews"}},"analytics":{"accountID":"wdgnewwdgnewgmaweb","ns":"gma","pageName":"gma:culture:video","pageType":"video","globalSpecVersion":"v1.08","siteDifferentiator":"gma:site","tagID":"g_page01","userABCookie":"0","section":"culture","title":"Bindi Irwin shares loving post for brother Robert","pubTime":"12:13","pubDate":"12-01-2022","modTime":"12:33","modDate":"12-01-2022","taxonomyTags":"none","id":94278097,"editorialOtherSubjects":"","wordCount":"none","columns":"none","authors":"Brittany Berkowitz","authorsUnit":"none","authorsBureau":"none","subBrand":"Good Morning America","provider":"Good Morning America","videoName":"Bindi Irwin shares loving post for brother Robert","mediaAssetTitle":"GMA BINDI IRWIN ROBERT BIRTHDAY POST","videoId":94278097,"mediaOnPage":"video","legacySlug":"/culture/story/bindi-irwin-late-father-steve-proud-brother-robert-94278097"},"taboola":{}},"request":{"headers":{},"httpVersion":"1.1","method":"GET","url":"/video/94278097","vary":{"host":"www.goodmorningamerica.com","cached":true,"path":"/video/94278097","forwarded-proto":"https","device":"desktop","userab":"0"}},"viewport":{"width":1260,"height":0},"user":{}};