The feature was first available for testing in May, but Google has now officially rolled it out in its latest update to the Messages app.
Google revealed the new updates in a blog post explaining: "Now when you receive a photo, video or chat message, you can react to it in an instant. Just long press on the message and you'll see animated expressions to choose from, like, love, laughter, surprise, sadness, anger and dislike. Reactions are available in Messages conversations with chat features enabled."
Other updates to the Messages app include expanding Smart Reply to include suggested stickers, a media editor to personalise photos, voice messages and video calling integrated in Messages.
People can access these features by updating the app to the latest version or by downloading Messages.