Here are some passages which describe idolatry.
Colossians 3: 5 Put to death, therefore, whatever belongs to your earthly nature: sexual immorality, impurity, lust, evil desires and greed, which is idolatry.
Romans 1: 22 Although they claimed to be wise, they became fools 23 and exchanged the glory of the immortal God for images made to look like a mortal human being and birds and animals and reptiles. 24 Therefore God gave them over in the sinful desires of their hearts to sexual impurity for the degrading of their bodies with one another. 25 They exchanged the truth about God for a lie, and worshiped and served created things rather than the Creator—who is forever praised. Amen.
So greed is an idol, greed is connected and caused by selfishness, so selfishness is idolatry. Worshiping and serving created things instead of God is idolatry.
So, TV celebrities, money, cars, etc., can be idols when they are more important to you than God. Just examine where you spend your extra money and time. Do you have an expensive house to which an excessive amount of your money goes to maintain? What is most important to you?
If you are a husband, what would you think if your wife placed a picture of an old boyfriend on the mantle or dresser? She does not 'bow down' to the picture, so why should you be jealous? What would you do?
If you are a wife, what would you think, if your husband had a female work associate's photograph on the wall in his work area? He does not 'bow down' to it, so why would you be jealous? What would you do about it?
What do you think God thinks when we place "things" as a priority of importance?