Big Bang Theory stars Johnny Galecki and Kaley Cuoco are sparking romance rumors.

In its Dec. 21 issue, National Enquirer claimed that it’s possible for Galecki to still have the eyes for his ex-girlfriend and former co-star Cuoco.

And now that he and his baby mama, Alaina Meyer have called it quits, it’s possible for Galecki to show interest in Cuoco again.

Last month, the actor paid tribute to Cuoco on her 35th birthday via his Instagram account.

Even though Galecki didn’t say anything to suggest that he’s interested in Cuoco romantically, this is still what the tabloid claimed.

A source also alleged that Cuoco’s husband, Karl Cook won’t be thrilled to know that Galecki is feeling nostalgic over his previous relationship with Cuoco.

The Big Bang Theory co-stars dated from 2007 and 2009 while playing on-screen lovers in the hit sitcom.

During her interview on Dax Shepard’s podcast, Armchair Expert, Cuoco said that she thought the show’s creator, Chuck Lorre purposely wrote steamy scenes between Penny and Leonardo after she and Galecki split in real life.

The actress also revealed that she had a huge crush on Galecki the first time that she saw him. However, the actor was dating someone else at the time.

Cuoco also said that she and Galecki are much closer now than they were before. And they are also good friends.

In 2015, Cuoco denied the rumors that she and Galecki got back together.

On her Instagram account, the actress shared a photo of herself with Galecki.

Cuoco said that she’s sorry to disappoint their shippers but she’s not a homewrecker, and she and Galecki don’t have a secret fling.

Galecki posted the same photo and said that he and Cuoco just have a profound friendship.

Cuoco has been married to Cook since 2018. But the couple has also been at the center of speculations after Cuoco revealed that they didn’t move in together after tying the knot.

During her interview on the Brad Behavior podcast, Cuoco said that she and Cook know what works for them and their marriage.

So, even though they were so in love and wanted to get married immediately, they decided that they also like to lead their own separate lives and stay on their own couches.

Cuoco also said that she wants her marriage to Cook to last that’s why they decided to take things slow.

But earlier this year, Cuoco and Cook finally moved in together amid the coronavirus pandemic.