Is Khloe Kardashian Engaged to Tristan Thompson?

Khloe Kardashian is sporting major bling on a very important finger!
The Keeping Up With the Kardashians star was in Cleveland on Tuesday evening to support her basketball star boyfriend
Tristan Thompson as his Cleveland Cavaliers took on the New York Knicks. After the Cavs defeated the Knicks, Khloe posted a photo of her and Tristan's hands on Instagram that sparked engagement rumors.
In the photo, Khloe is wearing diamond rings on her engagement finger (in addition to a Cavs band!). So does this mean Khloe and Tristan are engaged
This is so false, a source confirms to E! News. Though Khloe is "very into" Tristan and the relationship is "becoming more serious," the two aren't set to marry just yet!